Topaz 4” Square Welded Deep Boxes are 2-1/8” deep and 31.5 cu. in. to offer extra cubic capacity. Available in multiple eccentric and concentric KOs and raised ground emboss with installed 10/32 ground screw where noted, these junction boxes can be installed in walls or ceilings for lighting fixtures, switches, receptacles or other outlet devices. cULus listed and ROHS compliant.