Opt-X® 500i Rack-mount enclosure. Flush-mount adapter bulkhead makes moves, adds and changes easy. Stackable fiber rings simplify cable routing and organization. One-piece removable cover on enclosure allows for complete accessibility to the back of the enclosure and protect fibers. Constructed of 16-gauge steel, powder-coated black. Add-on patch cord cable management tray (sold separately) shares existing rack unit with the mounted enclosure.