Application: For Ceiling Fan Support | Box Type: Wall | Brand Name: Raco | CSA LIsted: No | Capacity: 11-13/16 cu. in. | Color: Gray | Depth: 1.5 in. | Diameter: 3.5 in. | ETL Listed: No | Height: 3-1/2 in. | Knockout Size: 1/2 in. | Material: STEEL | Number in Package: 1 pk | Number of Knockouts: 4 | Packaging Type: Bulk | Shape: Octagon | UL Listed: Yes | Weather Resistant: No 3-1/2 inch Octagon Extension Ring adds additional capacity to existing octagon boxes. The extension ring can be used as an outlet box for surface conduit. The ring measures 3-1/2 inch in diameter by 1-1/2 inch deep. | Octagon Extension Ring | 1-1/2 in. Deep | Drawn with Conduit KO's | Used in the installation of ceiling or wall lighting fixtures | Four 1/2" side knockouts | 11.8 cubic inch capacity | 50 lbs. maximum recommended support load | Acceptable for use in 2 hour rated walls and ceilings