Review on Precision Circuit and Jewelry Engraving Tool: Genmitsu 0.1mm to 3.0mm by David Banks

I received a set of PCB drill bits along with a vise that I bought earlier this year and they generally replaced my standard steel drill bits for most models . . For those who work primarily with plastic, especially styrofoam, these things cut through like it wasn't even there! A word of warning, especially to those of you with shaky hands; These bits are very brittle, especially if they're less than 1mm thick, but that means the material is extremely hard and will likely hold a much better edge than standard bits if you don't break them.