Square Box Extension Ring, 29.5 Cubic Inches, 4-11/16 Inches Square x 1-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, Welded Construction, For use with Conduit
- Knockout Diameter: 1/2 in
- Knockout Diameter: 3/4 in
- Mounting: Device
- Material: Steel
- Depth: 1 1/2 in
- Cubic Inches: 21 in³
- Number of Knockouts: 6
- Knockouts: Yes