2-1/8" Deep, 4" Octagon Ceiling Box By Appleton FFS561LD

4" Octagon Ceiling Box, Metallic. Depth: 2-1/8". Side Knockouts: (3) 1/2" . Fan Weight: 35 lbs. Fixture Weight: 70 lbs. Cubic Inches: 21.5".

• Knockout Diameter: 1/2 in
• Mounting: Screw On
• Depth: 2 1/8 in
• Mounting: Nail On
• Cubic Inches: 21.500 in³