Hubbell-Raco 937 4" Octagon Ceiling Box with Hanger, 2-1/8" Deep, KOs, Metallic

4" Octagon Ceiling Box with Bar Hanger, Metallic. Depth: 2-1/8"..Side Knockouts: (4) 1/2". Bottom Knockouts: (3) 1/2 Adjustable Length: 16" to 24". Fan Weight: 35 lbs. Fixture Weight: 50 lbs. Cubic Inches: 21.5".