Electrical Box, 42 cu in, Square Box Type, 2 Gangs, Galvanized Steel, Square Shape Back Knockouts 2, Number of 3/4 In.. Side Knockouts 12, Nominal Depth 2 1/8 in, Nominal Length 2 1/8 in, Nominal Width 4 11/16 in, Color Gray, Standards UL Listed Side Knockouts 12, Clamp Type -, Number of 3/4 In.