Fast Docking Coupler Bars Help You Create Custom Cable Management Schemes The SmartRack® SRWBTLCPLRBR includes 50 black powder-coated metal coupler bars for easy installation with your wire mesh cable tray. They connect straight sections of cable tray to extend your cable management application along the wall, floor or ceiling of your data center, network closet or industrial space. The coupler bars snap easily into the wire mesh with no mounting hardware required.