A. We are glad to introduce a practical accessory designed specifically for mountain bikes, road bikes, and fixed-gear bikes - the fork spacer. Made of aluminum alloy, it has excellent durability and stability, providing reliable support for your cycling journey. B. Its specification is 28.6 * 5/10 mm, and each box contains 4 pieces, which can meet your usage needs. Whether it is 5 mm or 10 mm in thickness, it can precisely fit the forks of different vehicles. You don't have to worry about compatibility issues and can easily complete the installation. C. This fork spacer is suitable for various mountain bikes, road bikes, and fixed-gear bikes, offering a good accessory option for your cycling equipment and making your ride more reassuring and comfortable. D. Hurry up and equip your beloved bike with this practical fork spacer!