Loading your boat has never been easier than this! Two front and two rear saddles with integrated rollers will have you and your friends on the water in no time. The spring-loaded base automatically adjusts to boat when loading. Mounts to any bar type without tools, making installation a cinch. Fits Yakima round, square, factory and aerodynamic bars. Spring-loaded base automatically adjusts to boat when loading. Smooth molded pad hugs and protects multiple boat types. Tilting paddle technology to accommodate an array of boats and roof rack systems. Includes Heavy-Duty Straps and Bow/Stern Tie-Downs.