Electrical Box, Box Type Masonry, Number of Gangs 1, Bracket Type -, Capacity 22 cu in, Material Steel, Number of 1/2 In. Back Knockouts 2, Number of 1/2 In. Side Knockouts 8, Clamp Type -, Number of 3/4 In. Back Knockouts 2, Number of 3/4 In. Side Knockouts 8, Nominal Depth 3 1/2 in, Nominal Length 3 3/4 in, Nominal Width 1 15/16 in, Color Silver, Standards UL File E195978