Yakima LandShark Saddles are contoured saddles that fit all popular recreational boats. The boat slides on effortlessly and the saddles then grip the hull for safe travel. It installs onto round or square crossbars quick and easily. It has long lasting stainless steel hardware. It includes a set of 4 saddles that will work for one boat. It can be secured to the rack using Heavy Duty Straps and Bow/Stern Tie-downs, which are sold separately.