Combination countersink and/or counter bore for standard wood plugs with standard hex shank will fit all power bit quick change chucks. Made of alloy steel & thru hardened with a 82 degree countersink angle. The drill bits are adjustable for different length screws with a 3/8" or 1/2" diameter counter bore. Your drill will not slip when using large 1/4" socket head screws.
Made in USA by Snappy.
For Screw Sizes #4 ( 5/64" ) , #6 ( 3/32" ) , #8 ( 7/64" ) , #10 (1/8" ) & #12 ( 9/64" )
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