4" Square Steel Outlet Boxes 1-1/2" Deep Welded with FM Bracket - 4" Square Steel Outlet Boxes are used in branch circuit wiring4" Square Steel Outlet Boxes 1-1/2" Deep Welded with FM Bracket features include: Drawn Steel ConstructionUsed in Branch Circuit wiringAccommodates wiring devices such as switches and receptaclesProvides excellent protection for wiring system or devicesMust be closed with a cover, canopy or wallplatePermits access to conductors for maintenanceAllows for branch circuit runs UL 514-A ListedCSA C22.2Listed Order Qty of 1 = 1 Piece Below is more info on our 4" Square Steel Outlet Boxes 1-1/2" Deep Welded with FM Bracket