General Tools 806 Jiffy Centering Punch The Jiffy Centering Punch makes centering screw holes for hinges, locks, brackets and other countersunk hardware; The tool's tapered end fits inside the hinge or bracket screw hole for automatic centering For quickly starting screw holes when attaching countersunk hardware such as hinges, hasps, hangers and drawer pulls Countersunk end ensures starting hole is centered in hardware screw hole Hardened steel pin for repeated punching and makes easily identifiable marks in wood surfaces Length: 2-1/2" (68mm). Body diameter: 3/8" (10mm)