Pre-drill and countersink to drive screws flush with the material surface or deep hole counter boring for driving screw heads below the surface. Ultra-sharp cutting flute clears chips efficiently and leaves a clean, smooth hole. Adjustable drill bit length for desired screwed depth, and features a flattened shank for a no-slip countersink connection.
Replacement Drill Bits for Countersinks and Modular 4-in-1 Drill & Driver
Precision ground with flatted shank to prevent "spin-out"
Includes two drill bit set screws to secure in the countersink