4 in Round Ceiling Box with a bar hanger that adjusts to 16 in or 24 in joist spacing. It has four Auto/Clamps. It is constructed with impact-resisitant Noryl thermoplastic, making it virtually unbreakable and non-conductive. Its depth-mounting gauge at bottom of bracket helps you align the box at the proper depth relative to the ceiling. 50 pack.
- Auto/Clamp cable clamps molded in, hold wire securly in box.
- UL Listed for fan and fixture support.