Electrical Box Box Type Masonry Number of Gangs 3 Bracket Type - Capacity 67.3 cu in Material Galvanized Steel Number of 1/2 in Back Knockouts 3 Number of 1/2 in Side Knockouts 16 Clamp Type - Number of 3/4 in Back Knockouts 3 Number of 3/4 in Side Knockouts 16 Nominal Depth 3 1/2 in Nominal Length 3 3/4 in Nominal Width 5 19/32 in Color Silver Standards File E195978 UL 514-A Listed