Widely Compatible The chain saw sharpener works with most 422 inch chainsaws and electric chainsaws and is compatible with different chain sizes such as .325 inch 3/16 inch, .404 inch 7/32 inch, 3/8 inch P3/16 inch, 3/8 inch P5/32 inch, 3/8 inch 13/64 inch, etc. It makes a practical gift for lumberjacks, garden workers, landscapers and DIY enthusiasts. Sturdy Material The sharpener features an anodized aluminum fixture that resists rust. The steel grinding burr is strong and longer lasting than a hard steel file. The hexagonal grinding head can also be used with electric grinding. Practical Design The guide tube is inclined at 30 degrees to better fit the chain tooth mouth. The slider can be moved by rotating the side button, so the grinding head firmly fits the chain tooth mouth. No need to take the setup apart or the chain, and it works in more complex environments to save time. It is a fast way to sharpen your chainsaw, and the tool can make work smoother and is worth the money. Use scenarios Onsite field sharpening at lumberjack jobs, forestry work, or landscaping sites. Home garden maintenance and DIY workshop projects where quick chain touchups are needed. Preseason maintenance or emergency sharpening during outdoor projects to avoid downtime.