One of the fun things about technology is that there are so many diverse subfields that nobody can stay current with all of them. Occasionally, you come across a tool or process commonly used in another field that seems amazing to those not used to it.
One of the students where I work recently brought in a set of micro-sized drill bits. These are a fraction of a millimeter in diameter; the smallest chuck for my Dremel tool wouldn’t hold them. Even the drill bits for the LPKF PC board milling machine that we use are larger.
I don’t know what they’re generally used for (pilot holes for micro-sized screws?), but whatever it is, it involves extraordinary precision!
Thanks for sharing, Mike!