# The Size of Standard Drill Bits
The drill bit, which comes in a variety of sizes, is the piece that goes on the end of a drill and that actually drills the hole in the wood or other material.
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Numbered Bits
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In the United States, some drill bits are assigned numbers according to their size. Standard drill bits are numbered from 1 to 80 and range from .3429mm to 5.7912mm.
Fractional Drill Bits
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There are 29 fractional standard drill bits that range from .397mm in diameter to 12.303mm. Each size is 1/64 of an inch bigger than the previous size.
Letters
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There are 26 standard drill bits that are assigned letters of the alphabet. These go from A, which corresponds to 5.9436mm, to Z, which is 10.4902mm.
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