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#12 Wood Countersink, Tapered Drill Features Widened Flutes For Drilling Fast, Clean Pilot Holes, 4 Cutter, Adjustable Counter Bore Cuts and Clears Chips For Fast, Smooth Countsinking, Counter Bore Attaches Securely To The Flats On The Shank With Hex Screws and Adjusts For Controlled Pilot Hole Depth, 1/4" Quick Change Shank Reduces Slipping In Standard Chucks, Compatible With All 1/4" Quick Change Chucks Including Impact Drills, Use For Fine Woodworking Projects, Bit Diameter 7/32", Counter Bore Size 7/16", Plug Size 7/16", Shank Size 1/4".