Thule Xsporter Pro Aluminum Truck Rack with Load Stops Custom Adjust bar height provides maximum carrying versatility for easy loading, carrying and storage Air Trip technology is integrated into the bar to redirect airflow for superior aerodynamics Wind Diffuser technology raised textured strip disturbs airflow for ultra quiet road performance Secure Lock locks the rack to the truck with four One-Key lock cylinders (included) Reinforced aluminum design provides strength to carry up to 450 pounds