I had a hard time drilling a 1/16" brass plate. I had to go through 3 drill bits to make it 1/16". I may have used the wrong lubricant or feed rate. But others Drill bits I've used with a similar technique seem to work well.Then I started using a dull drill bit as an engraving tool.I sharpened the shank at a right angle,put it in a vise and tried again with a soft brass sheet engrave. Don't go. Looking at the cutting edge under a microscope, the cutting edge is bent back. I hope I just have a bad batch, but I wouldn't recommend it for anything other than drilling a hole with all ten bits.