For rivets in aircraft. I assume that one is carbide too. I have the same one.
Ha! Pretty funny! I wondered if anyone else looked at GJ and this one. Seems like it would be more common. I use Star Wars spaceships and designations for my avatars.Lol, I just seen this posted on another forum. Now I know why your avatar is familiar whenever I see it over there.
Looks like some type of piloted countersink.
Do you know specifically what he did with them? Were they used to countersink holes, deburr, used as some sort of hammer bit, or something else?my pa used to use them at lochead martin when building planes.