I am a girl learning electrician. My question is for an electrician tap and drill set with sizes 6/32 to 1/4-20, what do those numbers mean and what is the clearance hole used for? Also, drills for tap are No. 36, 29, 25, 21, 7 and drills for clearance are No. 28, 19, 10, 10, and 1/4, what do they mean? I appreatiate it if anybody can help. Thanks. Thanks alot, it did help, but what is a clearance or body hole?
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