With this in mind, we spent two days testing four popular drill bit sharpeners. We learned a lot by sharpening 100 dull drill bits, including carbon steel, high-speed steel, titanium-coated, and ...
I've been thinking about buying one of these but I don't know if they are just a gimmick. Also, if they genuinely work well how good do your bits need to be in the first place to be worth sharpening?
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