Neiko 10059A Combination Drill And Tap Bit Set With Quick Change, Metric Tap Set 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. 3-IN-1 METRIC DRILL BIT SET: This innovative drill and tap set does three jobs in one, adding speed and efficiency to any job. Each bit piece provides hole drilling, tapping, and countersinking for a quick and complete job. 1/4-INCH HEX SHANK: Each bit features a convenient 1/4-inch hex shank with a tapered end to prevent overtapping and minimize oversized holes. This tap drill-bit set also includes a quick-change adapter for effortless bit changes. VERSATILE COUNTERSINKING DRILL-BIT SET: A must for any drill, this set contains 6 SAE drill bits, 6 metric drill bits, and a quick-change adapter. The bits can drill through a wide variety of materials, including sheet metal, plastic, copper, and more. HIGH-QUALITY DRILL TAP SET: Each piece in this bit kit is made from durable high-speed steel. The steel construction ensures sharp, fast execution with superior performance and minimal wear and tear. CONVENIENT PLASTIC CASE: The rugged molded plastic case is lightweight and durable for easy storage and organization. The swivel feature holds the bits securely in place for fast changes.