Fittings for 500 and 700 one-piece surface metal raceway Designed for use in hanging fixtures Cover takes any device with mounting screw centers of 2-3/4, 3-1/2, or 4-1/16 Base has four holes for fixtures studs; five 1/2 trade size knockouts and raised section for no-bolt fixture stud Solid base Ivory 4-3/4 diameter