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, #55264, (A°) angle: 49°, (D) diameter: 3/8, (D) shank: 1/4, overall length (L): 2-1/8, wood screw size: 8, D1: 7/64, replacement drill: 630-098, 55264 carbide Tipped 82 degree Countersink 3/8 dia x 49 Deg X 1/4 Quick release hex shank for wood screw #8