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, #55295, (A°) angle: 49°, (B) Cutting height: 9mm, (D) diameter: 1/2, (D) shank: 1/4, overall length (L): 2-3/8, drill DIN: 1897, wood screw size: 6, D1: 9/64, replacement drill: 630-228, 55295 carbide Tipped 82 degree Countersink with adjustable low friction depth stop, 1/2 dia x 9/64 drill DIA x 1/4 inch quick release hex shank