Starborn Smart-Bit #10 S Stainless Steel Pre-Drilling and Countersinking Tool 4 piece. Pack of 2. Packaging may vary. Smart-Bit Pre-Drilling and Countersinking Tool designed for decking and woodworking. The tool features a pre-set countersink, a free spinning stop collar to protect the work surface and replaceable powerbolic fluted drill bits that cut through decking more than twice as fast as standard wood bits. Comes with 2 replacement drill bits. Designed for flat head screws.