Last updated: August 18, 2021

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Today we are going to review the best drill bits you can buy on the market today. Drill bits are instruments with a sharp or pointed end that are used to make holes in hard surfaces by turning or by a succession of blows at high speed.

Drill bits can be incorporated into drills or table lathes for drilling holes in surfaces or reducing material. To preserve the life of the drill bits it is necessary to use them with a lubricant to control the temperature of the drill bits.

We want to provide you with all the information you need to buy the best drill bit for your equipment and your budget. In this article we will cover everything from the technical elements to all the necessary details so that you have everything you need to know about this tool at your fingertips.




Summary

  • Drill bits are cutting tools to be used in drills or lathes to create holes in various materials that are very hard to cut through. Drill bits are designed with a sharp, pointed end to achieve the cut.
  • The drill bit was invented by engineer Frederick Wisnlow Taylor in 1897 and was made from an alloy of cold steel and tungsten that is able to withstand the high temperatures that continuous use produces.
  • There are different types of drill bits for different jobs, but they can be grouped into 4 models: wood drill bits, metal drill bits, concrete drill bits, glass drill bits and finally SDS drill bits.

The Best Drill Bits: Our Picks

Buying Guide

For construction fanatics or those who make a living from construction, it is important to have good quality tools that allow for a perfect finish. This is similar with drill bits as they allow precise cutting and drilling in a fraction of the time.

Drill bits allow us to work on surfaces as hard as concrete or concrete to work on surfaces as delicate as glass. (Photo: Oxana Medvedeva /123rf.com)

What are drill bits and what are their advantages?

Drill bits are tools with a sharp cutting tip and a helical body that are used in a drill or lathe to drill holes or reduce material on different materials such as wood, metal or concrete.

Drill bits must be used with lubricants to maintain their useful life due to the high temperatures generated by the friction between the materials. The waste or chips are determined by the material of the workpiece to be drilled, the geometry of the drill bit and the cutting speed.

The helix of a drill bit has the purpose of cutting the material to which it is exposed, but it also has the function of evacuating the chips and dismembering the drilling waste into smaller pieces.

Advantages
  • They allow drilling different surfaces such as metal, wood and concrete, among others
  • They are durable
  • They cannot be easily broken or destroyed
  • They come in various models and sizes
Disadvantages
  • They can be very expensive
  • They are heavy
  • They require a drill or lathe to use them
  • If they are not handled with caution they can cause accidents

Drill bits for metal, concrete, glass, or SDS - what should you look out for?

The market offers a wide variety of drill bits depending on the work to be done. This tool can be grouped into 5 groups according to the material to be drilled. These are wood drill bits, metal drill bits, concrete drill bits, glass drill bits and finally SDS drill bits.

Wood drill bits have a thin tip for very precise drilling. This is because wood is one of the softest and smoothest materials that a drill bit can face and it is necessary to be precise when drilling. There are 7 models of drill bits for woodworking.

Metal drills are also known as HSS drills. These are used for drilling metal and materials such as plastic. They are made of high speed steel, although the quality of the drill bit may vary depending on the alloy and the method and quality of manufacture. There are 4 models of metal drill bits available on the market.

Concrete drill bits are used for drilling and boring construction site materials only. These drills have a reinforcement in the head that gives them a spade shape in order to increase the durability of the drill bit and to guarantee its drilling capacity. There are 2 models of this type of drill bit for use in construction.

Glass drill bits consist of a tungsten carbide shank and tip and have a spear-shaped tip. They are used for drilling glass, ceramics, tiles, porcelain, mirrors, tiles and other delicate materials.

Finally, SDS drill bits, unlike those mentioned above, have a direct entry, different in thickness and design. This gives them a superior performance to the above mentioned drills as they allow higher revolutions and less wear.

Variable Wood Bits Metal Bits Concrete Bits Glass Bits SDS Bits
Types Berbiquí, 3-point, Paddle, C, Forstner, E, Router Laminated, Ground, Titanium Ground, Cobalt Ground Tungsten Carbide and High Performance Carbide SDS, SDS Plus and SDS MAX
Tip Thin, sharp centre point for precise drilling Sharp, light tip Spade-shaped reinforced tip Tungsten spear-shaped tip Reinforced tip for extra strength
Use Wood drilling Metal drilling Wall and concrete drilling Glass, tile and ceramic drilling Multiple uses

Buying criteria: factors that allow you to compare and rate different models Drill Bits

Accurate and fast drilling can only be achieved with a good quality drill bit, otherwise you run the risk of irreparable damage to your material. But before you go out to buy your drill bit it is vital to know the factors that will make you buy the right product for your drill.

Size

In the market you can find different sizes of drill bits. From 1 mm in diameter, which are generally used for precision work, to 25 mm, for large constructions, but that doesn't mean that you won't find drill bits with precise sizes depending on the work you are going to do.

Drill bits from 1 mm to 3 mm. These are the smallest drill bits available on the market. These are used for jobs that require precision at low speed. It is common to see them for working with wood as it is a delicate material compared to others.

Drill bits from 4 mm to 10 mm. They have a medium size. Ideal for drilling that needs to be of medium depth. They can also be used for precision work, but perform better at higher speeds

Drill bits from 25 mm upwards. This type of drill bit is used in constructions where we do not have to worry about how the drilled material will look as the hole will be covered or covered by another element.

It is also normal that the diameter also determines the length of the drill bit. The smaller the diameter, the shorter the drill bit and therefore the shallower the depth of cut. That is why when you buy a drill bit you should buy a set with multiple options that allow you to make different types of holes.

You should not be without drill bits between 4 mm and 10 mm, although you may need other sizes from time to time. These can be used for a variety of jobs, from hanging pictures of different sizes and weights to installing furniture and shelves, as well as installing curtain rods or lamps, among other things.

A good drill bit allows you to achieve millimetre precision.
(Photo: Taechit Tanantornanutra / 123rf.com)

Surface to be drilled

As has been explained throughout this article, there are a wide variety of drill bits and each one can be used on different surfaces to achieve the most precise finish that can be achieved with this type of tool.

When choosing a drill bit, the surface to be worked on must be taken into account, as this will determine the equipment to be used. You cannot use a metal drill bit to work on glass or a wood drill bit to drill a metal plate because you will not be able to do the job.

The best thing to do in these cases is to acquire the different types of drill bits that exist gradually in order to have a wide range of options to choose from when you have to work with a drill. This way we will not run out of options.

Drill bits not only drill through hard materials, but also remove excess material quickly and gently.
(Photo: Chitsanupong Katip / 123rf.com)

Shank

This is another point to consider when buying a drill bit. Depending on the brand of drill or drill you own, the shank may be different. It is important that you look at the shape of the shank so that you buy the drill bit that will fit your tool.

There are currently 3 types of shanks that can be found on drill bits: round shanks, hexagonal shanks and SDS Plus and SDS shanks. Each is designed to work in compatible drills.

Round shanks. This model has a rounded shape at the bottom which is universal and therefore compatible with the vast majority of drills and lathes on the market. Its coupling system in the tools is by means of a key adjustment.

Hexagonal shank. As its name indicates, it has a hexagonal shape in its lower part and it is normal to see it in battery tools; they have the same coupling system as the round bits and are usually sold in kits that include an assortment of these bits.

SDS Plus and SDS-quick shanks. These are 2 patented coupling systems, which are used in hammer drills. This type of shank allows a very firm grip which is useful in hammer machines.

Many of the manufacturers that sell drills generally manufacture bits according to their machines, so it is always advisable to purchase equipment of the same brand in order to avoid compatibility problems when using them.

(Featured image photo: Jantararungsan/ 123rf.com)

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