Electrical Box, Box Type Octagon, Number of Gangs 2, Bracket Type -, Capacity 15.5 cu in, Material Steel, Number of 1/2 In. Back Knockouts 5, Number of 1/2 In. Side Knockouts 4, Clamp Type -, Nominal Depth 1 1/2 in, Nominal Length 4 in, Nominal Width 4 in, Color Silver