The adjustable horizontal lacer bar gives you the flexibility to have up to 4 different depths on the same horizontal plane (0", 2", 4" & 6") when used with LL-VA21! It provides optimal signal separation for the various cord types (power, AV, data) used on a single piece of equipment and reduces cable management complexity. The adjustable horizontal lacer bar also comes with easy break off tabs that let you pick your desired depth if you don't need all 4 depths, so you only have to stock (1) lacer bar!