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 ...

An image of a man grinding a drill bit on a bench grinder - Best_Stocker/Shutterstock We may receive a commission on purchases made from links. If you're a ...

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?

We may receive a commission on purchases made from links. If you're a professional craftsperson or even just an ambitious do-it-yourself devotee, then you know that a cordless drill is one of the most ...