What is it

[Macduf]

Looked odd , never seen it before

 

[pi_guy]

a spiny thing

It is used to seat valves.

 

[ferd]

used for lapping intake and exhaust valves in vehicle engines.

 

[AceofSpad3s]

Hand crank ******/eye massager.

 

[shadow images]

used for lapping intake and exhaust valves in vehicle engines.

 

[LXCam]

Hand crank ******/eye massager.

Can't be, it doesn't have the wire brush attachment.

 

[G_P]

Craftsman RotoPlunger™

 

[Ron Swanson]

Valve lapper.