The AirFlow2 roof rack allows you to carry gear and accessories on the roof of your vehicle with raised factory side rails. This complete roof rack system includes two double walled aluminum cross bars and four towers. The aerodynamically designed bar shape helps creates a quiet roof rack system for improved driving enjoyment. The full-length crossbars extend past the towers to provide additional mounting space for carriers. For security, the towers have built-in key locks to protect the racks from opportunity theft. Each rack firmly clamps onto the vehicle's raised side rails using the hex wrench provided. Product workmanship and material performance is ensured with a Lifetime Limited Warranty.