
I didn't buy this bit for it's intended purpose. I bought it because, like other unfortunate souls, I broke the easy-to-remove bolt extractor in the bolt I was trying to remove. It took a while but with a couple of these bits I was able to carve out a hardened easy to remove piece without damaging the hole already drilled. From there I bought a set of higher quality extractors and finished the job. If your usage intent aligns with mine, I recommend this bit. If you're looking for a chain sharpener I can't comment on that as I use the old filing method.

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