Electrical Box, Box Type Square, Number of Gangs 2, Bracket Type Not Applicable, Capacity 40.5 cu in, Material Steel, Number of 1/2 In. Back Knockouts 4, Number of 1/2 In. Side Knockouts 10, Clamp Type -, Number of 3/4 In. Back Knockouts 4, Number of 3/4 In. Side Knockouts 10, Nominal Depth 3 1/2 in, Nominal Length 3 3/4 in, Nominal Width 3 3/4 in, Color Red, Standards RoHS, UL Listed The large-capacity design accommodates oversized life safety devices, as well as local codes for easy identification of products relative to life safety systems.