Orbit 5SDB-MKO Deep Welded Square Box, Sheet Steel, 42 cu-in, 16 Knockouts, 4-11/16 in H x 4-11/16 in W x 2-1/8 in D 24 PackOrbit 5SDB MKO 5SDB MKO Product Description Orbit Industries 4 11 16 in square (5S) boxes are used to install lighting fixtures, switches and receptacles in ceilings and walls. They are constructed from 16 ga galvanized steel. These 2 1 8 in D, welded boxes have multiple knockouts in sizes 1 2 in and 3 4 in. Models include either a bracket for direct mounts on studs, a back support arm, support clips or a raised ground emboss and pre assembled 3 way,