TORX® is recognized as one of the three most efficient fastening systems because of their ability to transfer greater torque, reduce load and virtually eliminate tool slippage. Input Drive Size: 7/16", 3/8", 1/2" Drive Shape: Hex Length: 75mm Type: TORX® Bit Output Size: T40 Product Dimension (Refer Line Drawing Image) 7/16 Hex Dr. TORX® T40 Bit - Length 75mm