These four easy-to-install feet for the Thule Edge roof rack system attach to vehicles with raised railings, allowing you to attach your roof rack to the crossbars of your car. Lined with rubber, the surface of your raised railings is ensured to stay protected. The feet secure to your vehicle with the Thule One-Key lock (sold separately) and an ergonomic torque limiter key lets you know when your rack is secured to your vehicle.