Ko-ken Tools 1/2 Sq. Dr. Wheel Nut Socket 21mm Extra Thin walled Length 65mm Color coded ProtectorTHIN WALL The advantages of Thin walled design are : light weight for easier handling and flexibility to access narrow work space. Standard sockets are designed according to ISO DIN ANSI norms. However, wheel nut sockets are dedicated sockets for tightening and loosening wheel nut bolt. Therefore, they are designed according to the purpose of use. Spare Plastic Protector: Product Listing Length: 65mm Type: Wheel Nut Deep Socket Output Size: 21mm