2-1/8 in D, 4 sq-in corrugated steel wall boxes are installed in walls or ceilings for lighting fixtures, switches, receptacles or other outlet devices where conduits can't fit without bending or labor intensive offsets. These boxes allow the wall-ridge-mounted conduit runs to go straight into the knockout groups that are elevated on two sides of the box. Conduit runs mounted in the wall channel go straight into the non-elevated knockouts on the other two box sides. The raised ground terminal helps ensure a positive grounding connection.