Each Monster kneeboard rack is equipped with a thick rubber bumper to protect your board and a flexible tab to reduce rattle. Additionally, the kneeboard rack includes a simple, but effective UV-resistant shock cord to hold the kneeboards in place. The spread between the forks is adjustable to accommodate different board lengths with a thickness up to 4". The quick-release mounting system allows you to remove the rack without tools when trailering or docking in a tight slip. Just flip the latch, and simply take off the rack. The clamp stays attached to the tower, so it takes just seconds to return the rack to the tower when you're ready to hit the water once again. Made from strong anodized aluminum with stainless steel components and fasteners. Swivel adapter is designed to fit 2.5" towers.