The Umelee roof box mounting kit includes 4 zinc-plated alloy U-bolts, rubber washers, plastic support plates, security nuts, and black bandages. Made with high-quality materials, these U-bolts are resistant, durable, and compatible with most cars and vans on the market. Easy to install and store, this car accessory kit is a convenient choice for securing your roof box. If you are not satisfied with your purchase, please contact us and we will do our best to resolve it.