No matter what kind of rails you have on your vehicle, the Yakima RailGrab Tower does just what its name implies. It grabs onto your rails and refuses to let go. Broad range of fit - from raised to flush side rails (see fit list for specific vehicle information) Grabs hold of the crossbar with an iron grip for security and peace of mind. The low profile provides a sleek, integrated look. Quick, easy installation. Lockable with SKS cores - sold separately. Sold in sets of 4