For vehicles with raised factory side rails, the Whispbar Rail Bar roof-rack system provides carrying capacity and enhances vehicle appearance Whispbar's optimized aerodynamic profile leads the way in noise reduction by reducing drag by up to 70% Attach and remove Whispbar QuickDockTM accessories in seconds with the patented SmartFillTM technology in the bar Integrated SKS Locks included; rated for maximum load 165 lb / 75 kg per pair (specific vehicle roof ratings vary) Easy to install; Reference Whispbar fit information to find correct bar size for your specific vehicle For vehicles with raised side rails, the Rail Bar provides all the aerodynamic performance of the Flush Bar, while being the easiest bar to install on the market.