IRWIN Tools 1899795 Impact Performance Series Hex Shank to Square Drive Socket Adapter, 1/4-Inch Hex to 1/2-Inch Square, 6-Inch Length, 5-Pack 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 Black oxide finish resists corrosion and increases life of extractor