Drill pilot hole and tapered Countersink for wood screws. The 2-Flute integral design ensures uniform concentric results each and every time. Carbide Tipped for long lasting results in hardwood, plywood, plastics, etc, #55628, (A°) angle: 49°, (D) diameter: 1/2, (D) shank: 1/4, overall length (L): 2-1/8, wood screw size: 12, D1: 9/64, replacement drill: 630-268, 55628 carbide Tipped 82 degree Countersink taper #12 screw 1/2 dia x 9/64 drill DIA x 1/4 hex shank