IRWIN Tools 1899887 Impact Performance Series Hex Shank to Square Drive Socket Adapter, 1/4-Inch Hex to 3/8-Inch Square, 3-Inch Length Built for maximum durability and long life with impact drivers Ball retention design for quick-change applications Forged socket body for additional strength Black oxide finish resists corrosion and increases life of bit 1/4" quick-change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks