Electrical Box Box Type Masonry Number of Gangs 1 Bracket Type - Capacity 15.5 cu in Material Steel Number of 1/2 in Back Knockouts 2 Number of 1/2 in Side Knockouts 6 Clamp Type - Number of 3/4 in Back Knockouts 2 Number of 3/4 in Side Knockouts 6 Nominal Depth 2 1/2 in Nominal Length 3 3/4 in Nominal Width 1 15/16 in Color Silver Standards UL File E195978