I've been using them for many years, I can't beat them. I've used the ones that cost over $100 and don't wear out, but you can't compare how well they work. Hit it with a whetstone to clean and further sharpen it. I have enough for about a year, I sharpen the chain every day. I deflate my chain with an air compressor, it keeps the wheel from clogging with oil and other things, and it needs cleaning from time to time, which prolongs its life.
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