2-piece, pull chain, outlet box, incandescent lampholder. Plastic construction, topwired, 2 terminal screws and 2 clamps, removable interior mechanism. Medium base socket. 4-1/2 inch outside diameter, fits 3-1/4 inch or 4 inch outlet box. 250-watt/250-volt. UL (Underwriter's Laboratories) and CSA (Canadian Standards Association) listed. White.