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: 1/2" Drive Shape: Square Length: 77mm Type: TORX® Deep Socket Output Size: E8 Product Dimension (Refer Line Drawing Image): D 1/2 Sq. Dr. Deep TORX® E8 Socket - Length 77mm