I have always sharpened my chain saw with a chain saw file and handled, but never once was I able to sharpen it like it was a new chain. Now that I have bought and used the Vevor Saw Chain Grinder I am working a lot easier now that my chain saw cuts like it did when I bought it. This grinder makes my chain saw cut through trees like it was hot butter. It is simple to use and works very well. Certainly worth the money I paid for it. Before when my chain got dull, I had to buy a new chain because I could not get it sharped right with a file and guide.