SMART-BIT® from Starborn Industries as a pre-drilling and countersink tool with a countersink portion proportionate to the head of each corresponding screw size. It matches the head diameter, head angle and countersink depth of the hole and fit, and also includes a stop collar that spins free of the bit and a rubber O-ring to ensure the tool stops properly without leaving marks. It drills a 1-1/8″ deep hole and is available in five sizes for use with #7 and #8 trim-head screws and #10, #12 and #14 flat-and bugle-head screws. The Smart-Bit tool is packaged with two replacement drill bits and a hex Allen wrench. Pricing varies by screw size, starting at $14.99 for a #7 trim-head Smart-Bit.