"The FCAX extension brackets can be used with the LVM, LBM, LCM video wall products to get to larger displays and displays with wider mounting patterns.Please order a quantity of 1 unit per row of video wall. For example, for an LVM3X2U, you would need 2 FCAX brackets.- Adds 20"" of length to the LVM, LBM, & LCM mounts.- Allows LVM, LBM, & LCM to handle up to 60"" displays and 800 mm wide mounting patterns.- Easy to add on to any LVM, LBM, & LCM mounts."