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: 1/4" Drive Shape: Hex Length: 25mm Type: TORX® Bit Output Size: T40 Product Dimension (Refer Line Drawing Image): D Size: 6.3 1/4 Hex Dr. TORX® T40 Bit - Length 25mm