Designed for new construction when installing where ceiling joists are exposed or access is available. Kwik-Brace slides apart to accommodate joists of 14-1/8″ to 22-1/2″. Nailing spurs allow for easy brace positioning. Outlet box can be positioned in any location along the length of the brace. (5) 1/2″ knockouts. Simple fastener for tightening outlet box and brace. Easy-to-follow instructions and mounting hardware included. Maximum fixture weight is 110 lb, maximum fan weight is 70 lb. Exceeds National Electrical code requirements. Recommended for earthquake areas. No. 55501CC: Mount Type: Bracket, Width: 4″, Height: 4″, Depth: 1-1/2″, Volume: 16 cu in, Support Rating: 70 lb Fan/110 lb Fixture, Material: Steel, Metallic/Non-Metallic: Metallic, Construction: Drawn, Shape: Octagon, Color: Metallic, UL Listed: Yes, Pkg Qty: 1, Package Type: Box