Just lock the guard in place with the molded hook and strap then push down on the fender to protect the pontoon. For navigation pull up the elastic band and secure the fender in place. Constructed with a UV-resistant polyethylene outer shell and a soft PVC inner core that absorbs impact. Comes ready for quick installation on rails up to 1-1/4”. No assembly required. 7”W x 6”D x 36”H in the up position; 49”H in the down position.