Stanley Proto J4772TA 1/4-Inch Drive Universal Joint Socket, 5/16-Inch, 12 Point Proto Sockets are ideal for use on stubborn or damaged fasteners and also on fasteners made from soft materials The Torque Plus design is a high performance drive configuration which allows for quick and easy socket engagement to the fastener flats The Torque Plus configuration employs a radius-corner design, shifting contact area and stress away from the fastener corners The Torque Plus internal design minimizes fastener rounding, helps to extend fastener life