1-1/2" deep, 4" square drawn junction boxes with (8) 1/2" & (4) 3/4" side knockouts and (2) 1/2" & (2) 3/4" bottom knockouts installed in walls or ceilings for lighting fixtures, switches, receptacles or other outlet devices. There is a 1/4” threaded rod coupling that is welded to the back of box for quick mounting on the threaded rod. Cut the rod to desired length and spin box on, in one easy step. These boxes also have Chicago plenum “air tight” knockouts. Square boxes are used to bring power to a number of electrical devices where multiple conductor runs are split in two or more directions. Garvin Industries’ 4S Boxes can be surface or flush mounted when multi directional conduit runs are necessary. They include a raised ground provision on the bottom of box.