Large 1/4 inch gold socket head screw the drill bit will not slip. 3/8 inch or 1/2 inch diameter counterbore. Combination countersink and/or counterbore for standard wood plugs. Standard hex shank fits all power bit quick change chucks. Alloy steel and thru hardened for long life can be resharpened. Drill bits are adjustable for different length screws. 82 countersink angle.
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