Electrical Box Box Type Switch Number of Gangs 1 Bracket Type Adjustable Capacity 21 cu in Material PVC Number of 1/2 in Back Knockouts 0 Number of 1/2 in Side Knockouts 0 Clamp Type Non-Metallic Sheathed Cable Number of 1 in Side Knockouts 0 Number of 3/4 in Back Knockouts 0 Number of 3/4 in Side Knockouts 0 Zip Mount Retainers At Back Hub Location Number of Hubs 2 Rated Indoor Nominal Depth 3 3/8 in Nominal Length 3 3/4 in Nominal Width 3 7/8 in NEMA/IEC Frame NEMA OS-2