A. This headset tube fine-tuning shim comes in a variety of practical specifications, including 0.3 mm, 1 mm, 2 mm, and 3 mm. There is also a set of headset tube fine-tuning shim combinations (0.3 mm * 3 + 1/2/3 mm * 1). The 0.3 mm specification allows for precise adjustment to meet different fine-tuning needs. B. This shim has wide compatibility. It can effectively adjust the headset tube clearance and solve the problem of headset tube fork clearance. In terms of quality, it has good dust and water resistance, which can protect components from dust and water to some extent, thus extending the service life of relevant components. C. It has diverse uses. It can be used for the fine-tuning of the headset tube of bicycles and other related equipment, which helps to optimize the performance of the equipment and improve the comfort and stability of cycling. D. It is suitable for both professional cyclists and ordinary cycling enthusiasts. The product is reliable in quality and can provide solutions for the maintenance and upgrade of bicycle equipment.