The BR1 is an excellent solution for those looking for a clean and organized cable entry method when mounting equipment in a rack. This brush grommet panel is 1RU and has a built-in cable management tray that provides excellent support for your cables. The panel is made of steel construction with black powder coat finish and nylon brush, which not only provides a clean cable entry but also helps to slow down dust entry into the rack. The panel. Includes a cable management tray with strain relief tie points, making it easy to manage your cables and keep them organized.