The FAKRO LXT Additional Tread gives you an extra step up before entering the attic. The LXT tread installs between the attic ladder's last tread and the floor of the attic. It makes stepping into the attic easier and safer, especially when there is a large space between the last step of the attic ladder and the attic floor. The standard width of the LXT additional tread is 12 inches For use with FAKRO three-section folding attic ladders in 22-in x 47-in and 25-in x 47-in sizes