Although the original target base material gone, it was used for perforating aluminum. If you adjust the rotation and feed with a drilling machine, you can fully use it. However, I heard a pretty chatter sound. I think that it is a good product.
The sharpness is good. There are super steel chips attached to the tip of the bit, so there is a difference between the thickness of the blade body and the thickness of the chip, so it is necessary to get used to adjusting the cone size. As for the lifetime of the super-steel chip, it is unknown for now.