5.5mm metric 6 point deep socket ideal for use on stubborn or damaged fasteners as well as those made from soft materials. Features TorquePlusT system to grip fasteners tighter than a conventional socket. The radius corner design minimizes slippage and rounding and makes it easier to work worn, rounded or rusted fasteners. 3/8" square drive. Alloy steel with full polish finish. 1-3/32"OAL.