IRWIN Tools 1869517 Impact Performance Series Quick Change Extension, 1/4-Inch Shank, 12-Inch Length Built for maximum durability and long life with impact drivers Patented jaw design is compatible with all 1/4" hex shank accessories including insert bits Large chuck withstands higher torque demands of impact drills Black oxide finish resists corrosion and increases life of extension Black oxide finish resists corrosion and increases life of bit