No matter what kind of rails you have on your vehicle, the RailGrab does just what it's name implies. It grabs onto your rails and refuses to let go. With the RailGrab kit, now you have your whole rack system in one box. The Kit includes 4 towers to mount the rack onto the car and two 58 crossbars to mount onto the towers to create the ultimate base rack system. Broader range of fit from raised to flush side rails. Grabs hold of the crossbar with an iron grip. Lower profile provides sleek, integrated look. Install towers in seconds and stays put for easy removal. Lockable with SKS cores sold separately. Comes with a pair of 58 crossbars, long enough for most vehicles.