>>2327
They appear to be parts for a machine tool of some kind. Tried googling the codes on them?

Look like countersinks and maybe a counterbore.
Unusual mounting, no history - I wouldn't buy, and I buy a lot of crap from ebay.
However, go for it...

>>2329
Call the auction Counter-Strikes and fool some Russian hackers into buying them.

>>2329

The fact they have screw thread mounts and what appears to be a way to use different countersinks makes me thing it's for some sort of weird manual lathe.

List them as specialist recreational penile-sounding devices.

Ask on reddit whatisthisthing.

>>2327
They look like tool bits for a router - a machine that cuts grooves and bezels in wood.

>>2335
> a machine that cuts grooves and bezels in wood.
Cheers for clarifying that ladm3.

>>2336
I know right.

>>2335

Every router bit I've seen has had a plain shank. The overwhelming majority have a guide bearing, otherwise you get scorch marks. The holes in the side and tip look like coolant ports, which suggests that they're intended for metal machining. I think >>2329 is closest to the mark, but the threaded shank is very unusual. They could be designed for some kind of proprietary toolholder in a CNC machining station.