Tungsten Carbide tipped version of the popular Snappy drill countersink with adjustable HSS drill. This tool can be used in abrasive materials such as laminated chipboard.The drills produce pilot holes only. D=1/2 inch D=12.7 mm D2=9/64 inch D2=3.5 mm Shank Length=1/4 inch hex Screw size S/W=No.12 H/W=No. 10