20 cu inches Round Ceiling/Fixture Box With 16"-24" Bar Hanger; Captive Nail and Bracket Mounting. Designed to work with non-metallic sheathed cable in accordance with Article 314 of the NEC. Great for hotel guestrooms, multifamily, light commercial and residential applications, the box is crafted with non-conductive PVC for durability and is fire rated, and UL listed to help ensure safety.