Electrical Box Box Type Masonry Number of Gangs 2 Bracket Type - Capacity 45 cu in Material Galvanized Zinc Number of 1/2 in Back Knockouts 4 Number of 1/2 in Side Knockouts 12 Clamp Type - Number of 3/4 in Back Knockouts 4 Number of 3/4 in Side Knockouts 12 Nominal Depth 3 1/2 in Nominal Length 3 3/4 in Nominal Width 3 25/32 in Color Silver Standards File E195978 UL 514-A Listed