The 28517 provides a 12 in. by 1.26 in. wiring duct with cover for use inside our enclosures. Wiring ducts with covers enable you to route cables and wires into specific areas within an enclosure to help keep the inside of your enclosure neat and tidy. This benefit not only improves the appearance of your enclosure, but it also prevents wires from touching areas they shouldn't and makes maintenance, modifications, and troubleshooting easier later.