Large Heavy-Duty Wall Bracket Helps You Create Custom Cable Management Schemes The SmartRack® SRWBWALLBRKTHDL is a black powder-coated metal bracket, measuring 21 inches in length, for easy installation with your wire mesh cable tray. This wedge-shaped bracket allows you to mount sections of cable tray along the wall of your data center, network closet or industrial space to extend your cable management application. It mounts to the wall with user-supplied hardware and then easily snaps into the wire mesh. It fits cable tray sections measuring 150, 300 or 450 millimeters in width, such as Tripp Lite's SRWB6210STR, SRWB6410STR, SRWB12210STR, SRWB12410STR or SRWB18410STR. For best practice, tray support is recommended approximately every five feet.