Help in identifying what I think is some sort of drill or machining bit?

[tfaiers]

That's the problem, it was just in a pile of bits. I don't know what machine it's from.

The end isn't black, it's just a shadow, I really don't know.

I'm sure someone has seen one of these though, surely?

[johnsattuk]

Looks more like a small shaft with key-ways to accommodate a pulley or gear, can't see any cutting edges

[Kitwn]

It isn't a 'machine bit' it's a bit of a machine. Personally I'd just bin it and buy something I have a use for.

Kit