Standard Pack = 1 piece(s). Drill and chamfer and deburr in one operation. Positioning for drill Length can be varied instantly. Patented locking device prevents any axial movement of Cham-Bit. Single point cutter assures concentricity. Drill acts as a Pilot to reduce chatter. Easily resharpened on any drill Grinder without damage to the drill. Can provide an additional chamfer Diameter to a multi-Diameter drill. 90°ree ; Included angle. Drill Bit not included.