Drill Sizes
Drill Sizes :
Traditional drill sizes are numbers 1-80, with larger numbers indicating smaller drills. Number 1 has diameter 0.2280 inch and number 80 has diameter 0.0135 inch. Larger sizes are designated by letters or by specifying the diameter directly in 64ths of an inch. The metric drill size is the diameter in millimeters. EngineersEdge.com has a table showing the traditional sizes and metric equivalents
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