Complete drilling, tapping, and deburring/countersinking in a single operation with an electric drill will save time and labor. Back relief beyond the tap to prevent thread damage from over-drilling. Deburring and countersinking are also possible on the drill bit beyond the back relief. Made of hardened, high-speed steel for longer life than carbon steel. High-quality hex shank ensures a secure connection to the drill chuck. Designed for tapping in metals up to 10 gauge. Quick-change adapter included in both metric and standard kits. Specifications Material High-speed steel Material thickness Up to 10 gauge Material type Mild steel, copper, brass, aluminum Point type Cross point with tapered core Shank Quick-change hex 6.4 mm (1/4 in) Dimensions 6.4 mm (1/4 in) Threads per inch 20 threads per inch Thread type NC