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. Sizes:17mm, 19mm and 21mm. Chrome molybdenum sockets. Nylon sleeve to prevent damage. Hardened and tempered for strength. Anodised for corrosion resistance. Supplied in bespoke blow moulded case.