When choosing a roof rack, select one that matches the quality of the vehicle under it. Aries Clamp Roof Racks are made from high quality structural aluminum with an anodized finish. This style fits 42-, 45- and 50-inch rails. Aries Clamp Roof Racks include an integrated lock; removal requires a key. Aries Alloy Roof Racks feature high-quality aluminum construction with UV-stabilized, glass-reinforced nylon corners. The Alloy models are available in 47x32-inch, 59x40-inch and 71x58-inch models.