Electrical Box Box Type Octagon Number of Gangs 2 Bracket Type - Capacity 15.5 cu in Material Galvanized Steel Number of 1/2 in Back Knockouts 0 Number of 1/2 in Side Knockouts 2 Clamp Type NM-B Nominal Depth 1 1/2 in Nominal Length 4 in Nominal Width 4 in Color Silver Standards UL