Electrical Box Box Type Square Number of Gangs 2 Bracket Type - Capacity 30.3 cu in Material Galvanized Zinc 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 2 Number of 3/4 in Side Knockouts 8 Nominal Depth 2 1/8 in Nominal Length 4 in Nominal Width 4 in Color Silver