Tap Drill Chart and How to Use It | Home Repair -
Details. Give wood screws more bite by pre-boring with these tapered drill bits. This economical 22-piece set contains 7 drill bits with countersinks, stop collars, and an Allen wrench, all indexed in a wooden stand-up box. These bits let you drill perfect holes for #5 through #12 screws. #5 through #9 have 3/8' countersink; #10 has 7/16' ...
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