The accessories for the roof box are made of high- Stainless steel and plastic materials, which are wear-resistant and durable. The material is not easy to break and deform, and has a long service life Compatible with on the market, inner width 85 mm. Width from centre to centre of screw thread 90mm. The screws have a diameter of 7 mm The car accessories are small, lightweight and take up a small space can be easily stored in the room or in the car Can be used with roof up to 40mm thick It is easy and convenient to install and easy to use Colour:black Material:Stainless steel + plastic Package Contents: 1 set x roof luggage accessories Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.