These tools combine carbide Countersink, high-speed-steel drill bit and free-spinning, low friction depth-stop. The countersink leaves a clean hole edge and the adjustable depth-stop doesn't mar the surface. The large openings around the collar allow the chips to clear effectively and eliminate clogging, #55293, (A°) angle: 49°, (B) Cutting Height: 9mm, (D) Diameter: 3/8, (D) shank: 1/4, overall length (L): 2-3/8, drill DIN: 1897, wood screw size: 4, D1: 7/64, replacement drill: 630-224, 55293 carbide Tipped 82 degree Countersink with adjustable low friction depth stop, 3/8 dia x 7/64 drill DIA x 1/4 inch quick release hex shank