The Hand Tools company offers to buy metal drills from RESOLUX. Products manufactured under this brand are designed for convenient operation and the production of the most accurate holes in metal.

Depending on the standard, materials, characteristics, cost and production method, they are distinguished various types tool.

According to GOST 10902-77, in terms of quality and price, medium series drills with a cylindrical shank RESOLUX are divided into three groups:

1. Rolled drills R6M5 with the following characteristics:

• working part - polished;
• accuracy class B1;
• 1 - 20 mm;

Drills are mounted in three-jaw chucks of machine tools or hand drills. Manufactured in sizes starting from 13 mm. In this case, the shank is ground down to 13 mm, due to which a drill with a diameter of 16 mm can be fixed in a 13 mm chuck.

2. Drills for stainless steel P9 with the following characteristics:

• working part - polished;
• accuracy class B1;
• 1 - 13 mm.

Tools allow you to maximum efficiency process stainless steel, structural and other difficult-to-process steel grades. They are located in the middle price segment.

3. Drills R6M5 with accuracy class A1

These are professional tools that are widely in demand for production needs, at enterprises where increased demands are placed on the properties and characteristics of products, as well as on the precision of drilling.
In the production of tools in this series, high-quality steel grade R6M5 and the grinding method are used.
Suggested sizes: 1 - 13 mm.

Rolled drills are the most attractive in price, as they are made in the simplest and most accessible method. The low cost of the rolling method is explained by high speed and production automation:

• at the first stage, special blanks are made from rods;

• then they are heated and pulled through, due to which a working part similar to a spiral is formed;

• the workpieces are carefully ground and sharpened.

Grinding a working spiral from a single piece is the most expensive production method. The reasons for this are: low production speeds, the most careful processing and, as a result, the highest quality of the product.

Drills with a conical shank are produced by milling. Since complete automation of the process is impossible due to the large size of the workpieces, it requires a lot of time.

You can buy long and elongated drills with a conical or cylindrical shank from the company " Hand tools"in Moscow. For more information about prices for metal drills, please call.

Today in any hardware store There is a wide selection of metal drills. Among the variety presented, it is important to choose exactly what you need. How to choose drills, whether you need to purchase sets, and also about many other things that can help you do right choice read this article.

The drills with which I process metal consist of the following elements:

• Cutting part (main work).
• Shank (it is used to fix it in the chuck).
• Working surface (responsible for removing chips from the treated area).

To choose the best and most suitable model You should understand the types and shapes of drills. The following types exist:

• Spiral. Cylindrical drills classic shape, which are most often used for drilling metal. This is a high quality cutting type of steel. It is characterized by strength and durability.
  1. Cylindrical general purpose. The diameter can reach up to 80 mm. They are used both at work and at home.
  2. Left-handed spiral. They have a limited scope. For example, they are needed when you need to drill out a bolt with a broken head or fastener, which cannot be unscrewed.
  3. High precision drills. They are bought by those who want to achieve excellent result processing. They are marked A1.
• Stepped (conical). The cutting surface has a cone shape. Used to make holes in thin metal- to eliminate defects in other cutting tools. At high density metal, you should choose products with a golden color. The use of this type of tool in everyday life is rare.
• Ring (crown). This is a cylinder with cutting edge. The energy spent on making a hole with such a drill is low due to the small area of ​​contact between the tool and the working surface. Can drill holes large diameter with better quality edges than spiral models.
• Feather (flat). They are a special type of gimlets with replaceable edges. With their help they perform high-quality, straight holes. There is no distortion during the drilling process. It is also possible to change the hole diameter.
• Cobalt. Created on the basis high speed steel, which is doped with cobalt. It gives the product resistance to deformation (under mechanical or thermal influence) and high strength. Used for drilling tough, high-strength alloys and metals.
• Carbide. The plates of the same name are located on the cutting part of the drill. Tool steel makes up the main body of the tool. In the production of plates, carbide alloys are used, which are characterized by high wear resistance and hardness. Needed for drilling particularly hard alloys and metals, as well as products of large thickness.

Shank design

The shank is the part of the product that is clamped in the binding tool. They are divided into the following types:

• Cylindrical. They are common, have the same diameter and base size.
• Hexagonal. Designed for different models drills.
• Triangular. For clamping in special chucks.
• Conical. Needed for hand drills.
• SDS and splined. Designed for hammer drills, model range diverse.



Drill making method

The drill can be made from a single piece of metal or alloy.

To make a drill, soldering is used, during which the plates and tool holders are connected. For soldering, special welding powder is used.

To reduce the consumption of expensive tool steel, improve product quality and reduce labor intensity in manufacturing, pressure processing methods are used. After their use, a product is obtained with a highly accurate shape and size, which eliminates the need for further mechanical processing.

What shape of hole needs to be machined?

The difference and purpose of drills is what task needs to be performed. Based on the shape of the hole, they are divided into the following types:

• square;
• conical;
• stepped;
• cylindrical.



What are the drills covered with?

The following coatings are available:

• Oxide film. It is black in color and protects the instrument from rust and overheating. Increases drill life.
• Titanium nitride ceramic coating. Very durable, extends the life of the instrument by 3 times. This product cannot be sharpened.
• Titanium aluminum nitride coating. More reliable than the previous one.
• Titanium carbonitride coating.
• Diamond coating. It has no equal in strength.

Before you buy a metal drill, you should familiarize yourself with the characteristics and design features each type, and also adhere to the following recommendations:

• Purchase tools made from high-speed steel, which contains tungsten and molybdenum. The presence of these elements can be determined by the labeling.
• Select the sharpening angle according to the type of material. For bronze, values ​​of 130°-140° are suitable, for cast iron products- 118°, structural steel - 116°, stainless steel - 120°.
• Purchase products depending on the device in which they will be mounted. Since the fixation is carried out using a shank, close attention is paid to it.

Reference! If you don’t want to understand the types and labeling of products, you should contact a specialized store.

Main criteria for selection: required diameter, symmetry of sharpening, strength and hardness of the product, type of metal, manufacturer, price.

What does the color of the drill surface indicate?

The color of the surface of a metal drill is a parameter by which one can judge the quality of the tool:

• Grey. Low quality, low cost. No additional processing is needed.
• Black. Treated with superheated steam to increase strength and wear resistance.
• Light golden. Heat treatment, which eliminated residual stress inside the tool, improved strength.
• Bright golden. The best drills for metal, containing titanium. Reduced friction force. High cost.

Classification by size

A varied dimensional grid suggests standards by which a drill can be classified into one category or another. Such standards include GOST 886-77, GOST 10902-77, GOST 4010-77. These documents form 3 groups for the diameter and length of drills that are needed when working with metal:

• Short. Drills with a length of 20-131 mm, a diameter of 0.3-20 mm.
• Elongated. Length from 131 to 205 mm, diameter corresponds to the first group.
• Long. Diameter - from 1 to 20 mm, length from 205 to 254 mm.

If you need to make a hole for a self-tapping screw, it is unwise to take a drill with a diameter similar to the self-tapping screw. To select the appropriate model, you can use the tables that can be found on the Internet (dimensions of a sharp self-tapping screw with a press washer, for sharp self-tapping screws - black).

How to understand the markings

The designation contains the following letters:

• A - used for openings at 60°, there is a conical fuse;
• B - for 60° with fuse;
• C - for 75°;
• R - to obtain the arc shape.

There are also symbols that mean:

• P9 - increased wear resistance and ductility, but the product has low thermal tolerance.
• P18 - high grindability for a wide range of hardening temperatures.
• R6M5 - addition of molybdenum, drills have a tendency to lose carbon.
• R12F3 - 3% vanadium added, the product has low grindability, intended for work in medium conditions.
• R6M5F3 - have a long service life.
• R6M5K5, R9K5, R18K5F2 - contain cobalt in the composition, which guarantees hardness, heat resistance, as well as operation under high conditions.

Popular brands of instruments from foreign manufacturers

For precision drill selection from foreign manufacturer, you should have an idea of ​​the material that will need to be processed with their help. Thus, manufacturers recommend the following when choosing a tool with markings:

HSS-R and HSS-G. Tools (strength up to 1100 N/mm²) with this marking can drill products:

• steel, made by simple casting and injection molding;
• from alloy and carbon steels;
• from metal alloys, which contain graphite, copper, zinc, aluminum, nickel;
• made of malleable and gray cast iron;



HSS-G Co 5 (strength up to 1100 N/mm²). These became:

• stainless;
• carbon;
• alloyed;
• thermally improved;
• heat, acid and heat resistant.



HSS-G TiAN/TiN. If metal drills have this designation, this means that their working part is coated with titanium-aluminum-nitride coating. It increases the resistance of drills to corrosion and wear, which affects their service life. This marking allows the use of products for metal processing with a strength of 1100 N/m². Manufacturers give recommendations on the use of such drills for processing:

• gray and malleable cast iron, which contains graphite;
• copper-based alloys (bronze, brass, cupronickel);
• steel blanks that were produced by casting.



As for popular brands, preference should be given to products from the following manufacturers:

• Ruko. The drills produced by this brand are made with cross sharpening and have different type spraying. They have good value for money.
• Bosch. The name of this company speaks for itself.
• Haisser. Products of this trademark successfully cope with assigned tasks under extreme loads thanks to design features and the use of special alloys.

IN modern world There is large number products designed to work with metal. For making a hole in metal, nothing works better than a special drill. For this reason, it is so important to choose a product. Using low-quality products can cause harm metal object and to myself.

- it is important to know not only for professional builders, but also for those who often do metal work with their own hands.

Today in any hardware store you can buy drills of the most different forms and sizes, and it is important to choose from all this variety of equipment exactly what you really need.

In the article you will learn which drills are best to choose in this or that case, whether it is worth buying sets and which ones, or just one device, as well as other questions that will help you decide on choosing the right drill for metal.

Before buying a drill, be sure to decide for what purposes you will use it, otherwise choose correct option will be almost impossible.

You should choose a drill based on the type of drill you will use in your work, as well as the type of holes you will need to make.

For holes with large section, drills are used that have the appropriate length and diameter - usually these are powerful drills with low speeds.

Drill color – important criterion, helping to choose the right correct device. By color you can easily determine the quality of the product and, therefore, its expected service life.

It's better not to buy the device gray, because they are the least reliable of all.

Gray color indicates that the drill has not been processed in any way: protective layer, such instruments lack resistance to fire and deformation.

Naturally, buying such a drill will be the cheapest, but you won’t be able to use it more than once.

A black metal drill differs more high quality, because it was processed using superheated steam.

The service life of such products will be higher, as well as the cost, but their price is low, so buying such drills will not be a problem.

The most good drills- those that have a golden hue, however, they also differ from each other.

Tools with pale gold are somewhat inferior in quality to bright products - they undergo a processing process that allows you to relieve the internal stress that is present in the material, and also increases the strength of the product.

The most expensive ones to buy are bright yellow drills, however, they are the strongest and most durable. They are made from titanium - the most durable appearance metal

Such drills have a minimal level of friction, so it is more convenient to work with them, and their service life is much longer compared to other tools.

Of course, it is logical to buy the most quality device– this way you will save time and will be able to use the tool much longer.

If metal work is not your full-time activity, then you can get by with cheaper analogues - drills of black or light golden color.

The most important factor when purchasing a drill is its size.

It is not difficult to buy a drill of the size you need, because... The size range for this tool is very wide - the main thing is to know what size you need.

If you are not sure which size to choose, then it is best to follow the GOST classification, which divides all devices into 3 groups.

The first group includes short instruments, the size of which does not exceed 20 mm in diameter and 131 mm in length.

The elongated group includes tools that reach a length of up to 205 mm, while their cross-section parameters are similar to short drills.

Long group drills include tools with a diameter of 1-20 mm and a length of 56-242 mm.

Drill shape

A drill is a simple tool and consists of only three elements: the cutting part, the shank and the working surface, which is necessary so that the chips do not accumulate inside the hole, but are immediately brought out.

Although this is a standard tool for working with metal, many people also use it to work with wood, plexiglass, ceramics, plastic, concrete and other materials.

Thus, you can choose its shape, suitable not only for working on metal, but also for other surfaces.

According to their design, drills are divided into two groups: the tools of the first group are called flat, and the second are called spiral.

Decide which of the two types is most suitable for you before you buy a drill.

The advantages of flat tools are that they do not react to possible distortions during work, are cheaper than spiral ones and have a simpler design.

The disadvantages of such drills are their smaller diameter during sharpening and the lack of automatic chip removal.

One of the varieties of such drills is a conical tool for metal. This drill can be purchased separately or as a set, depending on your need.

A conical type tool is used to work with a drilling machine or a two-handed drill. If you need to make a hole with a large cross-section, then pay attention to this option.

A more popular type of drill is the twist drill. They are more often purchased due to their great application possibilities - they are suitable for creating almost any holes and working with different materials.

Such a drill has the shape of a cylinder, and on its “body” there are special recesses-grooves in the amount of one or two pieces.

Thanks to their presence, the chips do not linger during operation, but are immediately removed from the hole.

Spiral devices differ in the type of tail: it can be standard, crown, designed for threading, left-handed, high precision or stepped.

The standard cylindrical device has a diameter of up to 12 mm and can be used both in production and at home.

Private craftsmen most often buy this type of tool. A core drill is used to create large holes with a diameter of at least 30 mm.

The tip of the tool has a crown equipped with teeth. This device is best used for working on thin metal.

The threading tool allows you to create a thread of the required section. If you purchase a tool for these purposes, then you need to buy one that is 1 mm smaller than the cross-section of the future hole.

The stepped device is the most versatile because it allows you to make holes different diameters.

The only limitation on working with it is that it can only be used to work on sheet metal thickness no more than 2 mm.

The diameter of the tool is quite large and can reach 30 mm.

Buying such a drill is usually more expensive than others, but the price depends on the size of the section, and for small sections it will be quite acceptable.

The left-handed device can only be used to unscrew hardware: a screw, bolt or self-tapping screw, so buying it will only be relevant for these purposes.

Tools with increased precision are the best of all. They are purchased in cases where the result must be as high as possible.

The price of such devices depends on the accuracy class to which they belong - it can be class A1 or B1.

Manufacturer and labeling

Before you buy a drill, look at where and by whom it was made.

It is better to buy only proven devices, because... if the production technology was violated, then neither color nor correct form product will not help create a high-quality result.

From the right technology production depends on how well the tool will be sharpened, how durable it is and can last, resistance to corrosion and other external influence etc.

It is best to look in advance on the Internet for reviews of a particular company and buy a drill that has the largest number of positive reviews.

The highest quality metal drills are marked USSR.

Finding them today is not so easy, however, if you buy such a tool, it will last a long time: many note the high quality, long service life and minimal abrasion of the device.

Ruko tools are also deservedly popular: they are of high quality and reasonable prices.

The most popular models are the TL 3000, due to the fact that they have wide functionality, as well as cross sharpening and several layers of titanium modifications.

Such drills are not always used for working on metal - they are most effective in processing materials that form large chips, such as wood.

Before choosing a device marking, keep in mind that the diameter may vary depending on the manufacturer.

If you see a drill without markings, it means its cross-section is less than 2 mm; on devices with a diameter of 2-3 mm, the steel grade and cross-section are indicated, and on drills larger diameter you can also find information about the cross-section, grade of material and the presence of additional substances in it, if any.

The instrument marking includes a combination of letters and numbers.

It is better to remember them before buying a tool: the letter P denotes high-speed steel, the alphanumeric combination indicates the presence of additional impurities in the material: it could be, for example, K6 - this is how cobalt is designated, but there may be other impurities.

If you decide to buy tools Russian production, then there will be no other markings on them, but if these are foreign instruments, then they must also indicate: country of origin, trademark, grade of material, cross-section and diameter of the instrument, advice on use and accuracy class.

Foreign instruments have specific markings, usually a combination of letters such as HSS-R, HSS-G, etc.

Choosing a tool for apartment renovation. Choosing the right drills.

Drill – universal tool, which is simply indispensable when carrying out repairs of all kinds of complexity. Today there are many types of drills, and therefore it is very important not to make a mistake and make the right choice, so that later you do not have to replace, or even simply throw away such a tool if it fails prematurely. The site will tell you how to make the right choice.

Essentially all drills differ only in their appearance (diameter and length), as well as the material for which they are intended to work and, as a result, sharpened. Accordingly, it is necessary to initially select the size of the drill (it is necessary that such a tool matches the thickness of the material that will be drilled, or self-tapping screws, anchors, etc.). Next, you should select drills depending on the work that will be carried out.

Selecting a drill for metal

Metal drills differ from conventional drills (meaning those used for wood processing) in their versatility. Such a tool is indispensable when working with metals and can be used to create holes in alloyed and unalloyed steels, cermets, cast iron and non-ferrous metals.

The most common today are twist drills for metal. As a rule, such metal drills are a cylindrical rod in which two helical grooves are made, forming cutting edges. These grooves are made at an angle of 10-45° to the axis cutting tool.

You should also pay attention to the material from which the drill is made. By far the most quality tool for metal processing, it is made from high-speed steel (for example, R6M5) or alloy steel (9ХС). Such drills have increased durability and strength, and also make it possible to achieve maximum results in the process of work.

Choosing a drill for concrete

Concrete is a strong and powerful material, which is very difficult to process, especially to drill a hole. As a rule, special drills tipped with tungsten and cobalt hard alloy (“win”) are used for drilling concrete. Moreover, thanks to the use modern technologies In the manufacture of cutting tools, drills made from modified tungsten-cobalt alloys have appeared on the market.

For processing brick or concrete, drills with soft or medium soft tips are used. In the same case, if you need to process granite or other hard materials (for example, the same tile), then you simply cannot do without the use of Pobedit drills with plates of medium and high hardness (in addition, a series of teeth and reverse sharpening are performed on them).

Wood drill bits: how to choose?

For wood processing modern market offers the widest selection of highly specialized cutting tools. In particular, it is simply impossible to imagine working with wood without the use of three main types of drills:

• Twist drills are a sharply sharpened metal spiral that is used to create holes in wood of small diameter (8-28 mm) but quite significant depth (300-600 mm). Thanks to its spiral shape, such a tool is very easy to remove from working area after completion of work.
• Feather drills, as a rule, are used in cases where it is necessary to create any blind hole in wood with a diameter of 10 mm or more. It should be noted that such a drill can only be used to create holes, since due to the absence of cutting edges on the side surface, it is simply impossible to drill out what is already there.
• Cylindrical (ring, core) drills are widely used to create large diameter holes (from 26 mm). The main advantage of using such drills is the ability to obtain a neat hole without scoring or other defects, as well as high processing efficiency.

When choosing drills for work, you need to pay attention to their appearance. If we are talking about a truly high-quality tool, it should not have chips, dents, scratches or other defects. The cutting edges must be well sharpened along the entire length and have a uniform color.

At choosing drills, regardless of the material for which they are intended to be processed, you need to pay attention to their color - it is easy to determine from it the finishing hardening treatment that was carried out:

1. Steel gray – no treatment carried out.
2. Black – the drill has been treated with superheated steam to harden it.
3. Golden – the drill has undergone tempering treatment to relieve internal stresses in the metal.
4. Bright gold – a layer of titanium nitride is applied to the surface of the instrument, designed to strengthen it and extend its service life.

It would not be amiss to note the fact that when choosing a drill, you also need to pay attention to the manufacturer. It is best to give preference to famous companies that have been on the market for more than one year. Only in this case can you avoid counterfeits and unnecessary waste of money.

Everyone knows why a drill is needed - to drill holes. Many people know that drills are available for metal, wood and concrete. Some will be able to distinguish a Forstner drill from a feather drill. But progress does not stand still, and today there are dozens of types of drills on store shelves, differing both in design and material of manufacture, and in the features of application. And, of course, they also differ in prices.

A single metal drill can cost either 10 or 500 rubles, and at first glance there will be no difference between them. But the first one will get stuck in aluminum, overheat and become dull when drilling thick iron, and it simply won’t be able to drill stainless steel. In order not to throw money away when buying drills, you should clearly determine what material you need to drill and what characteristics of drills you should pay attention to when processing this material.

Drill characteristics.

View. Defines the drill design. There are the following types of drills:

Spiral (screw)– the most common type of drills. It is a metal cylinder with 2-4 helical spiral grooves that remove chips and reduce friction between the side surface of the drill and the walls of the hole. On one side, the drill is sharpened, forming – along the line of intersection of the sharpening and the front surfaces of the grooves – a cutting edge. WITH opposite side there is a shank designed to secure the drill in a machine or drill. There is often a marking on the shank, which can sometimes be used to determine the material of the drill and its performance characteristics. On Russian (and Chinese for Russia) drills, the steel grade must be indicated; on foreign-made drills, the marking may be different; most often, HSS (High Speed ​​Steel) is mentioned.

Lewis spiral or auger drill– differs from a twist drill in the number of spiral grooves (there is only one) and the cutting part with a centering tip. The tip has a threaded thread that allows the drill to penetrate into the wood independently without pressing on the drill. These drills are designed for making deep through holes of medium diameter. Holes drilled with a Lewis spiral have a smooth inner surface. The disadvantages include the high cost of such drills, the tendency to move away from the axis and to jam. Also, such drills are quite fragile.

To prevent deviation from the axis, we can recommend preliminary drilling to the maximum accessible depth with an ordinary thin (no thicker than the centering tip) drill. Up to this depth, the Lewis spiral will go in the desired direction, then the direction will be maintained by fixing the drill in the already drilled hole.

To prevent jamming, you should drill at low speeds; the power of the drill should correspond to the diameter of the drill and the drilling depth. For Lewis spirals with a diameter of more than 30 mm, drills with constant electronics, additional handles, power from 1500 W and high torque are recommended.

Feather drill has a flat working part with two cutting edges, separated by a centering tip. Behind the working part there is a shank, which is a relatively long and thin rod. Such drills are used for drilling large diameter holes (12-55 mm) in wood. The advantages of feather drills include ease of use and low price. Besides, deep holes with a diameter of 35-55 mm can only be drilled with such drills. There are also plenty of disadvantages:
- there is no chip removal, the drill must be frequently removed and chips removed from the hole
- the drill is prone to moving away from the axis and to drilling non-straightness; pre-drilling a pilot hole helps little
- the edges of the hole are rough, uneven
- it is impossible to drill a hole with a diameter larger than the maximum diameter of the centering tip
- the diameter and shape of the hole are not maintained accurately

Forstner drill allows you to make neat holes of large (20-40 mm) diameter in wood. Accurate cutting is ensured complex design cutting part, containing, in addition to two cutting edges, also radial cutters in a circle, cutting wood fibers before removing them with cutting edges. Two inclined channels in the cutting part remove chips. The drill is fixed in the hole due to the tight fit of the walls of the cutting part to the wood, which ensures straightness of drilling. The result is perfect round hole with a flat, even bottom (except for the recess from the guide pin) and smooth edges. The neatness of the holes allows you to use a Forstner drill in furniture making.
The disadvantages of Forstner drills include their high cost and the inability to drill holes.

Step drills They are a set of cutting parts of different diameters on one rod, arranged in increasing diameter. Designed for drilling sheet material thickness 1-8 mm. The maximum material thickness is determined by the height of one cutting part of the step drill. The main advantages of a step drill are accurate centering and neat hole edges; even when drilling large diameter holes in thin sheets. If you try to drill through a thin sheet with a large-diameter drill, the material will most likely be damaged and the center will not be able to be accurately maintained. Previously, such holes were drilled using a set of twist drills, gradually increasing the diameter. Step drill does the same thing, but without changing the tool. Also, the advantages of step drills are their versatility (with one drill you can drill holes of different diameters) and the ability to chamfer simultaneously with drilling. The disadvantages are the high price and limited thickness of the drilled material, determined by the height of the “step”

U milling drill there are sharp notches on the side edges, with the help of which it is capable of milling sheet material that is not too thick. Who among the craftsmen has not broken a drill while trying to widen a drilled hole by moving the drill along the surface? Conventional twist drills do not like this, and the effect is usually far from ideal - the grooves of twist drills are not suitable for milling. But with a milling drill, such a trick can be pulled off. Certainly, hand router Such a drill will not replace it - its productivity is low, and the quality of the cut leaves much to be desired. But for expansion drilled hole or for drilling oval holes it is perfect. Disadvantages of a milling drill:
- difficult to mill grooves: bottom part The router bit is a regular twist drill, and if the hole is not through, then this part will interfere with the milling.
- the thickness of the processed material is limited by the length of the milling part
- the load created by such a drill during milling is harmful to the drill bearings - you should move the drill along the surface slowly, with measured force, otherwise there is a danger of damaging the drill.

Centering punch- this is not a drill, but a device for accurately marking the installation locations of dowels in furniture parts. The punch is tightly inserted with the blunt part into the finished hole for the dowel (for this, a punch of suitable diameter is selected from the set), the part is applied to the one being connected exactly as they should be connected, and with a light blow on the first part, a mark is left on the second for drilling a counter hole for the dowel. This is the most accurate way to manually drill dowel holes.

Purpose of the drill determines what material it is intended for drilling.

Metal drills can be spiral, stepped and milling.
Metal drills must be made of high-speed steel. The marking on the drill should indicate this. If there are no markings on the drill, you should treat such a product with caution, especially if it has a low price. There are a large number of cheap low-quality steel drills on sale that are unable to drill a hole even in thin iron, let alone in stronger metals. If there is a marking, it can tell you what metals can be drilled with this drill.

Russian-made drills	Foreign drills	Properties
M1	HSS, HSS-R	Basic metal drills. Low price, satisfactory wear resistance. For drilling iron to a shallow depth. Low resistance to impact and overheating.
M2, P6M5	HSS-G	Drills for the widest range of applications. Increased wear resistance and strength. For drilling iron to any depth, as well as sheets of alloy and carbon steels, cast iron, non-ferrous metals. Increased resistance to impact.
M35, R6M5K5	HSS-E, HSS Co	Drills for difficult conditions operation. Increased hardness and wear resistance, increased resistance to high temperatures. Suitable for drilling stainless steel.
-	HSS-G TiN, HSS-G TiAlN	Drills coated with titanium nitride or titanium-aluminum-nitride. Maximum hardness and heat resistance. Designed for special drilling durable metals, titanium alloys. The price is high, sharpening is not allowed.

You can also get some idea of ​​the purpose of the drill by looking at the sharpening angle. An acute sharpening angle (80-90°) indicates that the drill is intended for soft metals. The most common sharpening angles are in the range of 100-120° - for drills for drilling steel and cast iron. Drills for drilling the most hard metals have a sharpening angle of 130-140°.

Wood drill There can be a twist and a feather drill, a Forstner drill, a Lewis spiral, as well as a step and milling drill. The twist drill bit for wood has special kind sharpening the cutting part - a centering spike is formed in the center of the drill during sharpening - it is designed to accurately center the drill at the selected point. You can drill wood with a metal drill, but due to the uneven hardness of the wood, at the beginning of drilling the drill may move to the side - to where the wood is softer. Therefore, if precision drilling is required, it is better to drill with a specialized wood drill.

Drills for brick and concrete most often they are spiral and have a soldering of pobedite at the end of the cutting part ( composite material increased hardness). When purchasing such a drill, you should choose products from trusted manufacturers, such as Bosch or Makita - Pobedit drills are inexpensive and such a purchase will not cause much damage to your wallet, but it will save you from buying a low-quality Chinese drill, which will not really drill through a concrete or plaster wall. At the same time, it should be borne in mind that it will be problematic to drill a hole of large diameter (more than 6 mm) and/or great depth in concrete even with the highest quality drill – even with an impact drill. If you need to make more than one or two such holes, they must be made exclusively with a hammer drill.

Spiral stone drills They are similar to drills for brick/concrete and differ only in the larger sharpening angle of the Pobedit cutting tip. Most often, such drills are universal and can drill both stone, brick or concrete. Another thing is that the productivity of such drills can be depressingly low - natural stone stronger than concrete and drilling a single hole can take tens of minutes.