4 Inch Square Extension Ring, 2-1/8 Inch Deep, Welded, Steel, Pre-Galvanized, Side Knockouts: (12) 1/2 and 3/4 Inch, Cubic Inches: 30.3
- Knockout Diameter: 1/2 in
- Gangs: 2
- Knockout Diameter: 3/4 in
- Material: Steel
- Depth: 2 1/8 in
- Cubic Inches: 30.300 in³
- Number of Knockouts: 5
- Knockouts: Yes