Expert Quality, unique profile 17mm, 1/2" Sq. Dr. nut socket designed for use on Mercedes C Class (W204) and E Class (W211, W212, W207) cars. Manufactured from solid chrome molybdenum steel and powered by a half-inch square drive impact wrench or ratchet. The thin walled design and nylon sleeve help protect the wheel when being used. An essential item for changing wheels on Mercedes - Benz C-Class and E Class vehicles.