Hubbell 4 inch Square Raised Ground Box was designed to enclose electrical wiring, switches, receptacles or lighting fixtures. Constructed from 1/16 in. pre-galvanized steel. 8-32 cover mounting screws assembled. Features TKO knockout design provides installation flexibility and has Combination screw heads that allow quick installation. Made of Welded construction and includes Ten 1/2 in. knockouts and six TKO knockouts. Acceptable in 2-hour fire-rated walls. Available in 2-1/8 in. Deep and 1-1/2 in. Deep