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Title: Use Once and Discard......
Review: I purchased these to sharpen chain saw blades. Very disappointed with their durability. After sharpening one chainsaw blade (16"), the diamond dust was essentially completely stripped off the shaft, rendering them useless for further sharpening. I'm going back to using the grinding stone version of the burrs . The stone wears, but at least I can sharpen the blade 5 or 6 times before having to replace the stone burr.
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