Rightline Gear Replacement Car Clips allow you to use any previously purchased Rightline Gear car cargo carrier on vehicles WITHOUT a roof rack. Replace lost Car Clips or add Car Clips to rear and roof cargo bags that did not come with any originally. Add the Clips to the ends of the car hitch cargo carrier's straps and attach them under the vehicle's door frame weather molding. The vehicle's doors close over the attachment straps. The coating on the Clips prevents any damage to the vehicle.