Electrical Box, Box Type Round Ceiling Pan, Number of Gangs 1, Bracket Type Adjustable Bar Hanger, Capacity 20 cu in, Material Polycarbonate, Number of 1/2 In. Back Knockouts 0, Number of 1/2 In. Side Knockouts 0, Clamp Type NMSC Clamps, Nominal Depth 2 3/8 in, Nominal Length 4 in, Nominal Width 3 11/16 in, Color Gray, Standards CM, RoHS, UL Listed