4" Round Ceiling Box with two captive mounting screws and four Auto/Clamps. 50 pack.
Constructed of impact-resisitant Noryl thermoplastic, making it virtually unbreakable and non-conductive.
Auto/Clamp cable clamps molded in, hold wire securly in box.
UL Listed for fan and fixture support.
Depth-mounting gauge at bottom of bracket helps you align the box at the proper depth relative to the ceiling.