Features: 1. The roof box accessories are made of high-quality stainless steel, rubber and reusable plastic, wear-resistant, corrosion-resistant, not easy to break and deform, and durable. 2. Internal width 85mm, width from the center to center of screw threads 90mm, the bolts are 7mm in diameter. Can be used on roof rack rail up to 40mm thick. 3. The roof box u bolts are equipped with rubber gaskets and plastic back plates, which can protect your car from scratches to the greatest extent, and can increase friction to improve overall stability. 4. Easy to install, use the attached accessories to assemble, the installation is stable, simple and convenient. 5. Easy to carry and store. The auto parts are light in weight, occupy a small space, and are easy to store in a room or in a car. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Material: Stainless steel + Rubber + reusable plastic Size: Internal width 85mm Width from the center to center of screw threads 90mm The bolts are 7mm in diameter Can be used on roof rack rail up to 40mm thick Product weight: 800g Color: Black Package: 8 screws, 4pcs/ each x other tool ( U-Bolts etc) includes: 1 set x Car Van Mounting Fitting Kit About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 143862 hours, wish you a happy shopping Thanks for your cooperation and well make you feel satisfied.