Irwin 1837509 Torx T40 x 2" Impact Power Bits - 10 per Bag T40 Torx Point x 2" Overall Length with 1/4" Hex Shank Built for maximum durability and long life with impact drivers Manufactured with heavy-duty, cold-forged, high-grade steel to withstand high torque output Black oxide finish resists corrosion and increases life of bit