Colt 10800122 MaxiCut RotaStop Forstner Bit, 1-1/4-Inch Dual cutting cams on outside edge creates saw tooth action for easier and faster drilling with clean entry and exit points Asymmetrical chip breakers produce easily removed chips rather than long sawdust swirls Sectioned rim and self cutting center point produces less heat and remains sharper longer Cutting edges can be easily re-sharpened Exclusive polygonal RotaStop shank provides optimal transfer of torque to cutting head and prevents damage from slipping in drill chuck