Need to level things out? Rhino-Rack offers a wide variety of leveling spacers that simply connect onto the leg. They fit neatly in one another to provide a seamless finish and style to the vehicle. The roof of a vehicle, in most cases, has a subtle or dramatic curve from front to rear. When fitting three of more crossbars to a vehicle, there is the challenge of maintaining a level working surface. Crossbars that are not level cause serious problems when loading and unloading not to mention they do not distribute weight evenly onto the roof of the vehicle. This can become a safety concern. The benefit of Rhino-Rack Leg Height Spacers? They are perfect for creating more height or leveling your crossbars which will assist in keeping your cargo, your vehicle and yourself safe during loading, transporting, and unloading.