Suitable for vehicles without roof rails. Not suitable for vehicles with roof rails. It is used to carry loads on your vehicle. It is required for mounting bicycle carriers, ski carriers, roof boxes, etc. The maximum load of the vehicle with this product is 75 kg. (Regardless of 2 or 3 aluminium poles, the legal limit is 75 kg.) After installing tents etc. when the vehicle is parked, a maximum load of 150 kg is recommended for the product with 2 aluminium poles and 225 kg for the product with 3 poles. The product is equipped with an additional lock mechanism after installation. It is used as a deterrent against theft. These locks must be opened with a key to disassemble the product. To confirm the compatibility of the product with other products, please check the technical drawing of the aluminium rod in the pictures of the listing. It cannot be guaranteed that it is fully compatible with other brands or products from other companies. ACE-4 model roof rack. The product is specially designed for your vehicle and is only used in vehicles without roof rails. It is definitely not suitable for vehicles with roof rails. It is used to carry loads on your vehicle. It is required for mounting bicycle carriers, ski racks and roof boxes. The maximum load limit with this product in a moving vehicle is 75 kg. (Regardless of 2 or 3 aluminium poles, the legal limit is 75 kg.) The assembly instructions of the product are delivered in the package. The assembly of the product is easy. One person can build the product without professional support. The aluminium poles do not need to be cut unless a wrong purchase has been made. Package contents: 2 aluminium poles (fully compatible with the vehicle in the title of the listing) connection kit for 1 vehicle (corresponding to 2 aluminium poles as follows). 4 pieces connection main body 4 pieces connection main body locked cover 4 pieces bottom support 4 pieces metal kit 4 locks and 2 keys 1 Allen other mounting accessories (screws etc.) suitable for the vehicle model mentioned in the title of the listing.