Box Support Bracket, Box Type Round, Number of Gangs 1, Bracket Type Adjustable Bar Hanger, Capacity 15.8 cu in, Material Steel, Number of 1/2 In. Back Knockouts 2, Number of 1/2 In. Side Knockouts 0, Number of 1 In. Side Knockouts 0, Number of 3/4 In. Back Knockouts 0, Number of 3/4 In. Side Knockouts 0, Nominal Depth 1 1/2 in, Nominal Length 16 in to 24 in, Nominal Width 16 in to 24 in, NEMA/IEC Frame NEMA OS-1, Color Gray, Standards cULus