4" Octagon Box Extension Ring, 1-1/2" Deep, 1/2" & 3/4" KOs, Steel By Appleton 40ESPL

4" Octagon Box Extension, Metallic. 1-1/2" Deep, Side Knockouts: (2) 1/2" & (2) 3/4". Cubic Inches: 15.5".

• Knockout Diameter: 1/2 in
• Knockout Diameter: 3/4 in
• Material: Steel
• Diameter: 4 in
• Depth: 1 1/2 in
• Cubic Inches: 15.500 in³
• Number of Knockouts: 4
• Knockouts: Yes