FeaturesLoosing the knob you can quick release the rack; You can adjust the rack to horizontal freely and fix the position with 2 pins; 2 1/2" clamp comes along with 5 rubber collars 2 3/8", 2 1/4", 2", 1 7/8", 1 3/4"; Holds 2 wakeboards;Anodized finish easy to clean and last long time.