Yeah, +/- .01mm diameter and round was a bit overstating. That's what id like to shoot for, but doesn't need to be quite that perfect. Let's say +/- .015mm. The holes that I interpolated with spring passes were measuring 4.33 to 4.34 at different positions, probably .01mm oblong in many cases and an occasional 4.32 and 4.35. This was accurate enough, just a pain to keep chasing the cutter wear. When I get the couple bits I ordered, I'm gonna throw the 4.305 in a cheap Chinese collet I have with some runout and see what the hole looks like. If I can push a 4.32 pin in it, I'm calling it good enough