Ko-ken Tools 1/2 Sq. Dr. Wheel Nut Socket 3 piece Set, 17-21mm, 6 point Thin Wall and Color Coded by Size1 2 Sq. Dr. Wheel Nut Socket 3 piece Set, 17 21mm, 6 point Thin Wall and Color Coded by Size THIN 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. Buy this set