Designed for vehicles with existing side rails no more than 50” apart, these universal fit Apex Aluminum Roof Crossbars clamp onto your rails and tighten in place using large easy-turn knobs. They feature a 150 lb. weight capacity, perfect for carrying extra luggage and other equipment on your next adventure. The clamps also have a ribbed rubber insert for increased traction and stability during travel. Lightweight and rust-proof, these crossbars are a perfect accessory for your next road trip- perfect for use with cargo boxes, cargo bags and roof top carriers. The cross bars are designed for temporary use only, remove when not in use or during the bad weather