The RACO 8257Go to product viewer dialog for this item. is a 4-11/16-inch welded square metallic electrical box designed for heavy-duty commercial or residential wiring applications requiring maximum volume. It features a deep 2-1/8-inch profile providing a large 42.0 cubic inch capacity to house multiple conductors, large wiring devices, or lighting fixtures. Constructed from pre-galvanized sheet steel for optimal rust resistance, it includes a raised ground bump and combination Phillips/slotted screw heads for fast mud ring or cover installation. The box offers flexible conduit wiring access with one 1/2-inch knockout and fifteen patented TKO combination 1/2-inch and 3/4-inch knockouts across its sides and bottom. This junction box is UL Listed and rated for circuits up to 600 volts