4" Square, Extension Ring, Drawn, Metallic. Depth: 1-1/2". Side Knockouts: (8) 3/4". Cubic Inches: 21.0". Combo Extension-Thru-Ring. Top has (2) 8-32 Screws & Bottom has (2) Slide On Slots.
- Gangs: 2
- Knockout Diameter: 3/4 in
- Depth: 1 1/2 in
- Cubic Inches: 21 in³