IRWIN Tools 1882442 Impact Performance Series Irwin Quick Change Extension, 1/4-Inch Shank, 2 1/2-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 1/4" quick-change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks