RACO 1-Gang Masonry Box Nongangable 3-1/2 in. Deep with Ten Concentric KOs

Masonry Boxes are manufactured from durable pre-galvanized steel and are 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. Knockouts for conduit connectors and mounting holes are designed to resist slurry from entering box.|Welded steel construction|Supplied with eight 1/2 in. and 3/4 in. concentric knockouts|Standard device spacing with tapped 6-32 holes for devices|22.5 cu. in. capacity