Timberline 608-112 Quick Release Countersink for #6 Wood Screw Size by 3/32-Inch Diameter by 3/8-Inch Countersink Diameter by 1/4-Inch Hex Shank, Carbide Tipped 1/4-inch hex shank design for quick release For #6 wood screw size Cutting diameter 3/32-inch, countersink diameter 3/8-inch 1/4-inch hex shank Carbide tipped, professional quality