The BT8390-WFK5 is an adjustable bracket designed to fix BT8390 and BT8393 rails to uneven walls for a level installation. The BT8390-WFK5 is also compatible for pole and column mounting using B-Tech's System 2 and System X mounts. Ideal for DVLED mounting, the bracket features keyhole fixings for a quick installation and an easy to use rail depth adjustment.