Electrical Box, Box Type Masonry, Number of Gangs 4, Bracket Type -, Capacity 89.8 cu in, Material Galvanized Steel, Number of 1/2 In. Back Knockouts 4, Number of 1/2 In. Side Knockouts 20, Clamp Type -, Number of 3/4 In. Back Knockouts 4, Number of 3/4 In. Side Knockouts 20, Nominal Depth 3 1/2 in, Nominal Length 3 3/4 in, Nominal Width 7 13/32 in, Color Silver, Standards File E195978, UL 514-A Listed