IRWIN 1899822 Impact Performance Series Screwdriver Insert Bit, 3/16-Inch Hex, 1-Inch, 25-Pack Built for maximum durability and long life with impact drivers ensures both ends of bit lock securely in impact drivers and quick-change chucks, enabling use of two tips from one bit Manufactured with heavy-duty, cold-forged, high-grade steel to withstand high torque output Black oxide finish resists corrosion and increases life of bit Black oxide finish resists corrosion and increases life of extractor