Exposed Work Covers are manufactured from durable pre-galvanized steel and are designed to house and protect electrical wiring, switches and receptacles in surface mounted or exposed work applications. All steel covers are UL listed and acceptable for use in 2-hour fire rated walls and ceilings. Mounting provisions are designed to make installation efficient. Raised 1/2 in.RACO® exposed work covers include required hardware for mounting the receptacle(s)1/2" raised7.3 cubic inches4" diameter