Daewon Industries 1 Count 0.30mm Japanese Tungsten Micro Drill Bits for CNC PCB, Toy Making, Model Cars, Jewelry, Woodworking

Work great. I have used a lot of the Versatile Bits to drill through HDPE plastic. Of course they break easy, they are only .020" in size, with the flutes they are thinner than that. You obviously have to treat them with care.

I have tried a number of small diameter bits with fair to poor results. These tungsten bit have held up the best of the lot...or I'm learning how use use small bits better with time. Hopefully, both.

No matter how steady you think your hand is, you need a dremel drill press to use these. I can get a couple of holes done by hand before I break a bit, but I've done 15 in a row in a press. I suppose that would seem obvious, but I was putting medallions on a hiking pole and thought hand drilling would work. A quick learning curve took me to my press.

These bits work great for plastic modeling. The larger shank makes them easier to install in my pin drive while staying centered, versus the others I have purchased with tiny shanks.

They do drill very nice holes, and go easily through plastic, but they also break very easily. I was using them to work on a model and ended up breaking 5 in a couple of hours. I do like the case they come in though.

Compared to other bits I’ve tried, including dremel brand, these are the best I’ve found for preparing silver for setting stones.

They break very easily