Topaz 4” Square Welded Deep Boxes are 2-1/8” deep and 31.5 cu. in. to offer extra cubic capacity. This box comes with two one-half inch eccentric KOs on the side and two one-half inch concentric KOs on the side and one on the bottom. These junction boxes can be installed in walls or ceilings for lighting fixtures, switches, receptacles or other outlet devices. cULus listed and ROHS compliant.