IRWIN 1876224 Impact Performance Series Grip Double-Ended Screw Extractor Insert Bits, 3-Piece Built for maximum durability and long life with impact drivers ensures both ends of bit lock securely in impact drivers and quick-change chucks, enabling use of a single bit Manufactured with M2 high speed steel and extra-hardened for maximum durability and long life with impact drivers Tip of drill end is designed to start fast with minimal walking and tip of extractor end is serrated for increased torque Manufactured with heavy-duty, cold-forged, high-grade steel to withstand high torque output