Drill Bits are an important tool as they are the main part of a Drill that make the hole. Different materials need different types of drill bits. Coming to the Drill Bit Sizes, these are the diameters of holes that we want to make and are represented as gauge numbers, fractional inches or just straight forward millimeters. We learned the importance of drill bits, types of drill bits and also standards associated with drill sizes. We also learned different representation of Drill Size Chart and also all the important Drill Bit Size Chart.

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Power Tools help you to cut, make holes, hammer and many other tasks with very little effort and produce pretty accurate and precise results. Of all the power tools, the Drill is perhaps the most commonly used tool by residential users, DIYers, woodworking, automobile, construction and electrical workshops. Depending on the type of materials you work with, you will need a variety of Drill Bits for the job. Apart from the right type of Drill Bit, you also need the correct Drill Bit Size. With the knowledge of Drill Bit Sizes, you can select the right drill bit or opt for a close alternative. So, in this guide, let us get to know different Drill sizes with the help of Drill Bit Size Chart or Drill Size Chart.

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Just like other gauges, the Drill Bit Sizes are also defined as per different international standards. In the U.S., Fractional Inch and Wire Gauge & Letter are very common whereas in the rest of the World, the metric drill bit sizes are predominant.

An electric drill is perhaps the most common and frequently used power tool. The main job of a drill is to make holes in wood, metal, masonry and other materials. Cordless Electric Drills are becoming extremely popular in both the DIY community as well as with the professional usage.

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Defined in the ANSI B94.11M-1979 Standards, the fractional inch drill bit sizes start from 1/64 inch and scale up all the way to 1inch with 1/64inch increments.

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The following image shows a typical cordless electric drill along with all its important parts. A drill usually has a handle with good grip to hold the drill, a rechargeable and removable battery, a trigger switch and a chuck. Speaking of chuck, it has two parts: metal jaws that hold shank of a drill bit and a plastic part that rotates to tighten or loosen the jaws.

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After #1, the gauge number end and letters start with ‘A’ all the way up to ‘Z’. Here, A is next largest drill bit size then #1 and the pattern continues with Z being the largest.

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Before diving into Drill Sizes and Drill Bit Size Chart, let us quickly take a look at some of the popular types of drill bits.

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Let us now see the Drill Bit Size Chart. Since there are different standards and representations, we will also have multiple charts, with chart having the diameter both in inches and millimeters.

Metric Drill Sizes are straightforward representation with the drill size (equivalent to gauge number) is same as the diameter of the drill size.

Coming to the Drill Bits, they are the main rotating parts that make the holes in wood (or other materials). Depending on the type of material we are working on i.e., wood, metal, masonry etc., there are different type of drill bits.

The Number & Letter Gauge drill bit sizes are very similar to American Wire Gauge (only in the representation but not the actual gauge numbers). The largest gauge number (for example #107) indicates the smallest drill bit size and as the numbers decrease (#1), the drill bit size also increases.

If you are familiar with the wire gauge (the circular tool that helps you identify the diameter of a wire), there is also a Drill Size Gauge or Drill Bit Size Gauge. It is usually a rectangular plate with several holes corresponding to different drill sizes. The following image shows a typical drill bit gauge (not to scale).