Irwin Insert Impact Screwdriver Bit - Impact insert bits are engineered for maximum durability and long life with impact drivers. Precise fit which reduces stripping and increases the life of the 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. - Size: Phillips #2, Length: 1", Shank Diameter: 1/4", Pkg Qty: 20, Package Type: Box