Product Description IRWIN SCREW-GRIP Impact Performance Series Extractors feature DoubleClick Technology ensuring both ends lock so a single bit drills and extracts to easily remove stripped or damaged screws and small bolts. They're manufactured with M2 high speed steel and are extra-hardened for maximum durability and long life with impact tools. The tip of the drill end is designed to start fast, with minimal walking and the tip of the extractor end is serrated for increased torque to easily remove even the toughest bolts and screws. Plus, they have a black oxide finish that resists corrosion and increases the life of the extractor. From the Manufacturer IRWIN SCREW-GRIP Impact Performance Series Extractors feature DoubleLok Technology ensuring both ends lock so a single bit drills and extracts to easily remove stripped or damaged screws and small bolts. They're manufactured with M2 high speed steel, and are extra-hardened for maximum durability and long life with impact tools. The tip of the drill end is designed to start fast, with minimal walking, and the tip of the extractor end is serrated for increased torque to easily remove even the toughest bolts and screws. Plus, they have a black oxide finish that resists corrosion and increases the life of the extractor.