Extension Ring Box Type Square Number of Gangs 2 Capacity 43 cu in Material Galvanized Steel Number of 1/2 in Back Knockouts 0 Number of 1/2 in Side Knockouts 8 Number of 3/4 in Side Knockouts 4 Nominal Depth 2 1/8 in Nominal Length 4 11/16 in Nominal Width 4 11/16 in Color Silver Standards CSA UL