The Landmark 550 4’ Extension Kit is an optional accessory you can get to increase the height of your Landmark 550 Tower from 8’ to a total of 12’ tall. Use this extension kit so you get a better field of view while you’re out hunting. The 4’ Extension Kit is an add-on option that you can assemble in a short time period. If added height is what you are looking for, make sure you get the 4’ Extension Kit for your Landmark 550 8’ Tower.