In this comprehensive guide, learn how to sharpen drill bits effectively using an angle grinder. Perfect for both DIY enthusiasts and professionals, this video outlines detailed steps to restore your ...

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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?

This article was taken from the March 2015 issue of WIRED magazine. Be the first to read WIRED's articles in print before they're posted online, and get your hands on loads of additional content by ...