![]() The size of the hole that can be drilled increases with diameter. The diameter of a drill bit, or the distance across the widest point of the bit, establishes its size. Typically, drill bit sizes are expressed in inches or millimeters. can be as small as 0.05 mm, while the largest can be several inches in diameter. Typically, the numerical number falls between 1/4 inch and 1-1/2 inches.
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