A. This bicycle fork head tube washer kit is made of aluminum, offering good quality and performance. B. It comes in various specifications. A set includes three 10 - millimeter washers, one 5 - millimeter washer, one 3 - millimeter washer, and one 2 - millimeter washer. Additionally, it is equipped with a screw, a shock absorber core, and a stem cap, which can meet different usage needs. C. This washer kit is suitable for mountain bikes and fixed - gear road bicycles. It can be used with a 28.6 - millimeter fork, helping users easily solve the installation and adjustment problems of the bicycle fork, thereby improving the comfort and stability of riding. D. Whether for daily riding or professional riding, it is a practical accessory that can ensure a good riding experience.