Precision Made All with 60 Degree Points used to drill countersink center holes in a workpiece to be mounted between centers for turning or grinding. It also used as starter holes to prevent a drill bit from "walking" Sizes Include 1 x bs1 1/8" HSS 1 x bs2 3/16" x 5/64 HSS 1 x bs3 1/4" x 7/16 HSS 1 x bs4 5/16" x 1/3 HSS 1 x bs5 7/16 x 3/16" ) HSCO
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