The NEIKO 10059A Combination Drill- and Tap-Bit Set is a convenient 3-in-1 drill-bit set that lets you drill, tap, and countersink holes. These multipurpose bits are made from high-speed steel and are designed to ensure sharp, fast execution with superior results. Each bit in this tap and drill set has a 1/4-inch hex shaft with a tapered end to prevent overtapping. The durable countersink bits will fit most drills and are built to withstand a lifetime of rugged use.