Single and double grains file designs allows for quick chain grinding without the need for complex operations Suitable for beginners and experienced users, it solves the problem of difficult operations of traditional files, making it easy to use with every polishing process Widely applicable to various occasions such as horticulture and logging, meeting different work needs Whether it ' s home garden maintenance or professional logging operations, this file can provide and improve work efficiency Suitable for professional forestry workers who require frequent use of chainsaws, it solves the problem of traditional circular files being difficult to polishing accurately Crafted from High Carbon Steel, the lifespans of the file is doubled compared to ordinary steel Its rigidity ensures that it is not easily deformed or worn out during long-term use, suitable for users who work outdoors for long time, and reduces the frequency of tool replacement Hexagonal hexagonal fine tooth designs provide a more efficient chain grinding Three different types of files, 4.0mm, 4.8mm, and 5.5mm, can accurately adjust the chain teeth shape, making cutting smooth