SurfStow SUPRAX XL Kayak/2 SUP Storage System with Pontoon Mount The product is a tension mount installation and it only works on pontoon rails that are completely square. Please note some of the newer pontoon boats do not have completely square railings. These racks WILL NOT fit those style rails.*Features:Store that big kayak securely, and safely, on the side of your Pontoon boat with YAKRAXGet your kayak to its destination, in style. Free up deck spaceThe rotating clamp allows for secure mounting on angled stanchions. Secure your kayak to your boat and your wall with optional wall mounts WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.