4" Square, Extension Ring, Drawn, Metallic. Depth: 1-1/2". Side Knockouts: (12) 1/2". Cubic Inches: 21.0". Combo Extension-Thru-Ring. Top has (2) 8-32 Screws & Bottom has (2) Slide On Slots.
- Knockout Diameter: 1/2 in
- Gangs: 2
- Depth: 1 1/2 in
- Cubic Inches: 22.500 in³