Electrical Box, Box Type Masonry, Number of Gangs 1, Bracket Type -, Capacity 15.5 cu in, Material Steel, Number of 1/2 In. Back Knockouts 2, Number of 1/2 In. Side Knockouts 6, Clamp Type -, Number of 3/4 In. Back Knockouts 2, Number of 3/4 In. Side Knockouts 6, Nominal Depth 2 1/2 in, Nominal Length 3 3/4 in, Nominal Width 1 15/16 in, Color Silver, Standards UL File E195978