Installation requirements: the bicycle needs to be equipped with V brake hole and reserved hole in the middle of the front fork; For details, please refer to the installation requirements in the following product content. Configuration: due to different models and different screw lengths required by customers, this product leaves the factory with only the assembly screws of the shelf itself, not the installation screws of the car. You can yourself or buy it at the nearby according to your own needs. Please take it carefully. 1. All aluminum alloy, ultra light and rust free. 2. The length of the connecting piece with the frame can be adjusted. 3. Assembly structure, shipping standard, less space, convenient for long-term transportation. This product has the advantages of high-quality material selection, fine workmanship, smooth , normal installation and large load carrying capacity. Name: ultra light solid aluminum alloy front and rear shelves. treatment: Painting The front shelf the size is about 13cm wide and 18cm long. The rear shelf, the size is about 13cm wide and 30cm long. Screw package accessories: fixing piece + assembly screw, etc Color: Black Material: Aluminum alloy Package Contents: 1 x Folding Bike Front Racks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.