Highly Robust - The Impact Control Socket is highly robust when screw-driving hex screws with impact drivers and wrenches. S2 Modified Steel and an optimised heat-treatment process provide the socket with extra-tough endurance for high performance. This product is intended for screw-driving heavy-duty applications such as plant installations or in heavy industrial work. For use with adapters in impact drivers or directly with impact wrenches. Square drive shank compatible with three-jaw drill chucks. Features and Benefits:Highly RobustThe Impact Control Socket is highly robust when screw-driving hex screws with impact drivers and wrenchesS2 Modified Steel and an optimised heat-treatment process provide extra-tough endurance for high performance Specifications: Shank: 1/2" Width across flat: 17; 19; 21mm Length: 85mm