I bought it because of a counterbored screw. I used it for aluminum, but I could cut enough. In the case of small screws, we care about the depth adjustment slightly when processing with a drilling machine. Also, if you make the drill length on the small diameter side a little shorter, you do not have to worry about interference during machining with a face on the opposite side like a pipe. I would like the one with the small diameter drill part short.
Almost hand - powered drilling, so it is often a leading blade? I will break it. It depends on the degree, but I'm happy if it is a little hard to break. I think that it is good to process stainless steel to some extent using cutting oil. I am searching for the best use for it.