Professional design: The socket is specially designed for the special "flower head" Mercedes-Benz ear nuts. Not suitable for standard hexagon ring nuts or locking ring nuts.(Please check your vehicle and product pictures before ordering.) Compatibility: Compatible with 2007+ Mercedes CL-Class, GL-Class, GLK-Class, GLS-Class, and S-Class vehicles with 17mm convex, “flower head” lug bolts. Product material: Mercedes Lug Nut Socket is forged from chrome-molybdenum alloy steel with protective sleeve around the socket which is designed to prevent scratching and marring of your wheels during maintenance Tool applicable: 1 / 2 " drive socket, used with handheld, electric or power tools.