Molded of heat and impact resistant plastic to prevent discoloring and reduce breakage. Mount on 4 in outlet and have breakouts for 3-1/4 in boxes. Mounting screws included. Terminal screws, staked and backed out ready for quick easy wiring without removing interior. Socket permit interior replacement. Dust ring protects against plaster and dirt. Include short length of ball chain, connector, 3 ft of cord and end bell. With shade groove.