Choose a Base Rack that best suits the type of mounting method you have, i.e., existing factory racks or no racks at all. The Base Rack without Rain Gutters is designed for cars with smooth roofs and includes a telescopic knob for quick installation. The Base Factory Rack mounts bars to raised factory rails and features a sleek locking cover design. The Multi System Base Rack is designed for cars with C-Channel track systems and works with factory-installed and most aftermarket track systems. All racks include locks and are protected by a five-year limited warranty. Black finish.