Stem mounting available for ½" and ¾" N.P.T. pipe; specify. Canopy is held in place with a slip ring. Canopy is 5 5/8" Dia. x 1" deep. Kit for mounting to 4" octagon box included. To order stems see above. Reflectors ordered with stems & canopies are factory wired and are suitable for wet location. Be sure thread sizes of canopy, stem and reflector hub all match. NOTE: If installed outdoors use a thread sealant on stem threads.