Stanley Proto J7420TX 1/2-Inch Drive Torx Impact Socket, E20 Proto Torx Impact Sockets can be used on stubborn Torx fasteners Tight tolerances for snug fit on fastener Torx Impact Sockets are used wherever power drive tools are used to help install or remove fasteners Torx Impact Sockets are designed to withstand the high torque and force associated with impact tools in repetitive applications Socket size stamped on tool for easy identification