Electrical Box Box Type Square Number of Gangs 2 Bracket Type FM Capacity 40.5 cu in Material Galvanized 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 4 in Nominal Width 4 in Color Red Standards UL