4Pcs Universal Roof Box U Metal Bolt Clamps Car Mounting Bracket Mounting Fitting U Clips Kit Rooftop Cargo Carrier Rack Bolts 85mm Internal Width with 8 Lock Nuts and 2 Straps Features: Compatible with most cars on the market. Made of stainless steel, wear-resistant, durable, not easy to deform, and can be used for a long time. Simple and convenient to install. Protect your car from scratches and increase friction, improve overall stability and good restraint. Please confirm the size and appearance of roof box and install place before purchasing. Specification: Meterial: iron+plastic Size: Inner width 85mm/3.34in; Thread center-to-center width: 90mm/3.54in; Screw diameter: 7mm/0.27in. Package Included: 4 x U bolts 4 x rubber washers 4 x plastic support boards 8 x heavy lock nuts 2 x bandages 1 x black sticker