None 3-1/2 in. D Galv. Steel Gray 2-Gang Non-gangable Masonry Box with 16 Concentric KO's, 1-Pack

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.