Irwin  Impact SCREW-GRIP  DE-3  Double End *Sub Brand: Impact SCREW-GRIP *Extractor Size: .15 in. *Material: M2 High Speed Steel *Product Type: Double-Ended Screw Extractor *Extractor Length: 2 in. *Number in Package: 1 pc. *Packaging Type: Clamshell *Maximum Contact Size: 14 in. *Minimum Contact Size: 11 in. *Overall Length: 2 in. *Removes Bolts: 5/16 in. * Removes Screws: 11, 12, and 14*DoubleLok Technology ensures both ends of bit lock securely in impact drivers and quick-change chucks, enabling use of a single bit to remove stripped, damaged or rusted screws and small bolts in three easy steps: drill, flip bit, and extract. 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 to remove even the toughest bolts and screws.