4-11/16" Steel Outlet Boxes 13 Knockouts - 4-11/16" Boxes are used for a wide variety of industrial applications where larger sized conductors or wiring devices are needed and more volume is required.4-11/16" Steel Outlet Boxes 13 Knockouts features include: Combination screw heads provide for faster installation UL 514-A ListedCSA C22.2Listed Order Qty of 1 = 1 Piece Below is more info on our 4-11/16" Steel Outlet Boxes 13 Knockouts