A. This multi-functional file is a practical tool for mountain bike maintenance, with excellent grinding and trimming functions. B. In terms of specifications, it is a complete file that can meet the daily maintenance needs of mountain bikes. C. In terms of applicability, it can be used for the trimming work of the mountain bike's front fork steering tube. It can precisely remove burrs and make the edge of the steering tube smoother. Whether for professional bike repairers or enthusiasts who like to maintain their bikes by themselves, it can adapt to different usage scenarios. D. It is reliable in quality. Made of metal, it is sturdy and durable and can withstand relatively large grinding forces. During long-term use, it is guaranteed to be less likely to be damaged and can be used repeatedly, providing stable and long-lasting support for bike maintenance. E. It has a wide range of uses. In addition to trimming and deburring the mountain bike's front fork steering tube, it can also be used for the grinding work of other metal parts. It is an indispensable helper in the process of bike maintenance and repair, which can effectively improve the efficiency and quality of bike maintenance.