Starborn BDA146 Smart-Bit Flat Head Tool, #10Highlights: Two larger sizes with longer bits, great for boardwalks and timber applications The smart bit tool package contains one (1) complete tool, two (2) extra replacement bits and one (1) hex wrench Cuts through decking more than twice as fast as standard wood bits, even dense hardwoods Creates a screw hole and countersink portion that is perfectly matched to the pro plug fasteners Bits are replaceable Size: 10"