Electrical Box, Box Type Square, Number of Gangs 2, Bracket Type Not Applicable, Capacity 42 cu in, Material Steel, Number of 1/2 In. Back Knockouts 3, Number of 1/2 In. Side Knockouts 12, Clamp Type -, Number of 3/4 In. Back Knockouts 4, Number of 3/4 In. Side Knockouts 10, Nominal Depth 2 1/8 in, Nominal Length 4 11/16 in, Nominal Width 4 11/16 in, Color Gray, Standards UL Listed This square box is for use where larger-sized conductors or wiring devices are needed and additional volume is required.