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.Īfter #1, the gauge number end and letters start with ‘A’ all the way up to ‘Z’. The Number & Letter Gauge drill bit sizes are very similar to American Wire Gauge (only in the representation but not the actual gauge numbers). 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.ĭefined 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. Just like other gauges, the Drill Bit Sizes are also defined as per different international standards. But unlike spade bits, Forstner bit make flat bottoms. This bit also helps you make wider holes, just like spade bits. Forstner Bit: We use these bits primarily with drill presses rather than handheld drills.The tip of these bits is wide and is usually made up of tungsten carbide, which is known for its strength. Masonry Bit: As the name suggests, we use masonry bits to make holes on concrete, bricks, cement and stone.Hence, we can consider a wood-spur bit as a cross between twist bit and a spade bit. Unlike conventional twist bits, which have a flat end, the Wood-Spur bit has a pointed end, just like a spade bit. Wood-Spur Bit: Also known as Brad Point Bit, is a type of twist bit that is primarily used with wood. ![]() The point end centers the bit for the hole and the paddle shape part will follow to make a wider diameter.
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