None 3-1/2 in. D Galv Steel Gray 3-Gang Non-Gangable Masonry Box with 19 Concentric KO's, (1-Pack)

Masonry boxes are manufactured from durable pre-galvanized steel and designed to house and protect electrical wiring, switches and receptacles in masonry walls. All steel boxes are UL Listed and acceptable for use in 2-hour fire rated walls and ceilings. Device ears inside the box prevent mortar from getting in the device holes.