This set of 1/2" (mm) deep impact sockets is for use with alloy wheel with a nylon sleeve to prevent damage to the wheel. These chrome molybdenum sockets have been hardened tempered and anodised for corrosion resistance and are colour coded for easy identification. All sockets have a nylon insert to prevent damage to alloy wheels. For use on impact tools. Supplied in a bespoke blow moulded storage case. Specifications: Sizes:17mm 19mm and 21mm. Extra deep. Chrome molybdenum sockets. Nylon sleeve to prevent damage. Hardened and tempered for strength. Anodised for corrosion resistance. Supplied in bespoke blow moulded case.