The 1-Gang Ceiling Box with 24 in. T-Grid Hanger Bar is designed to support fixtures up to 50 in. It is to be used for indoor application. Made of thermoplastic material, this ceiling box is durable and will not conduct electricity. The box mounts with a 24 in. T-grid metal hanger bar that provides superior support. The box meets NEMA OS-2 and it is UL Listed and fire rated to help ensure safety.