Model: CMAT133 Set 3 PC Screw Extractor Craftsman 3 pc. Screw Extractor Set is designed with a DoubleLok Technology™ ensuring both ends of the bit lock securely in impact drivers. Manufactured with M2 extra hardened high speed steel for maximum durability and long life. Features: QUICK-CHANGE CHUCK: DoubleLok Technology ™ ensures both ends of bit lock securely in impact drivers and quick-change chucks MAXIMUM DURABILITY: Manufactured with M2 high speed steel and extra-hardened for maximum durability and long life with impact drivers MINIMAL WALKING: Tip of drill end is designed to start fast with minimal walking INCREASED TORQUE: Tip of extractor end is serrated for increased torque to remove even the toughest bolts and screws Applications: Removes stripped, damaged or rusted screws and small bolts Includes: (1) #1 1-4-in. Shank Double-Ended Screw Extractor (1) #2 1-4-in. Shank Double-Ended Screw Extractor (1) #3 1-4-in. Shank Double-Ended Screw Extractor