Electrical Box, Box Type Switch, Number of Gangs 1, Bracket Type Old Work, EZ Mount Retainers, Capacity 21 cu in, Material PVC, Number of 1/2 In. Back Knockouts 4, Number of 1/2 In. Side Knockouts 0, Clamp Type -, - Hub Location, Rated -, Nominal Depth 3 3/4 in, Nominal Length 3 1/2 in, Nominal Width 2 1/4 in, Color Gray, Standards UL