Proto 12 point impact sockets are ideal for use on stubborn or damaged fasteners, and also on fasteners Made from soft materials, The TorquePlus design is a high performance drive configuration which allows for quick and easy socket engagement to the fastener flats, not the corners, The TorquePlus configuration employs a radius-corner design, shifting contact area and stress away from the fastener corners and distributing contact stresses over a large area of the socket, minimizing slippage, The TorquePlus internal design minimizes fastener rounding, helps to extend fastener life, and allows the user to more easily turn worn, rounded, or rusted fasteners, stamped size for easy reference.Exhaustive in our efforts to make the world?s safest tools, Unique in the marketplace, relevant to our customer?s work style, Proto helped build 1934 Fords, the Golden gate bridge and Apollo 131, made in America, making the highest quality tools Comes first, confidence that our tools will help keep them working longer and safer.