I was looking for a set of drill bits for my Proxxon FF 230 microcutter and this set is perfect. Smaller milling machines often lack headroom and larger drills are simply too long. With screw-length drills, I can usually set the reference point with my edge/center finder and then immediately insert the desired drill without changing the table-spindle distance. These drills are sharp and precise. I've bought a few Chinese drill bit sets lately, and while you can get a 115-piece set for less than $50, good luck drilling metal with them and getting the hole round and close to your desired size too bring.