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Difference #30 drill bit v. 1/8" bit? 100deg countersink supplier?



The plans call for a #30 drill bit in many places for a 1/8" pop rivet, but
what is the difference? Also, do you know where I can find a 100 degree
countersink? Aircraft Spruce shows one for $46!! and what attachments are
needed to complete this tool, thanks in advance, chris brock.