None 3-1/2 in. D Steel Gray 1-Gang Gangable Masonry Box with Ten TKO's, 1-Pack

Manufactured from durable pre-galvanized steel. 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.