1. The roof box accessories are made of high-quality stainless steel and plastic materials, which are wear-resistant and durable. This material is not easily deformed and has a long service life. 2. It is compatible with most products on the market. The inner width is 85 mm. The thread width from center to center is 90 mm. The screw diameter is 7 mm. The automotive accessories are small, lightweight and take up little space. They can be stored indoors or in the car. 3. It can be used with a roof with a thickness of up to 40 mm. It is easy to install and convenient to use. 4. Color: Black. Material: Stainless steel + plastic. Package content: 1 set of X roof luggage accessories. The package only contains the above package content and no other products. 5. Note: Due to light reflection and different monitors, the color of the items in the picture may vary slightly from the actual object. Please allow a measurement error of +/- 1 - 3 cm.