Well I've never sharpened a lawn mower blade in my life (I'm in my 50's). In fact, after my last lawn mowing, I could tell there was a problem with the blades, so check out YouTube to learn how to properly sharpen your blades. I bought a drill to sharpen blades but after more research it seemed to me that a good file was crucial so I got these and WOW I was always impressed. The blades on my Honda mower were in terrible condition when I pulled them, very dull and with lots of nicks. This file put the blades back where they should be and made them nice and sharp like new or better. The file was very easy to use but like other reviews I've read it would have been nice if it was about 3-4 inches longer but still ok. If you want to sharpen blades, take it, you won't regret it! I know this works great for lawn mowers, I believe it will work well with any metal blade. I'm so glad I have this! Highly recommended!
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