1-1/2 in deep 4 in square drawn boxes with (6) 1/2 in & (6) 1/2 in-3/4 in side knockouts and (3) 1/2 in & (2) 3/4 in bottom knockouts are installed in walls or ceilings for lighting fixtures switches receptacles or other outlet devices. 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' 4S Boxes can be surface or flush mounted when multi directional conduit runs are necessary.