What are these things

[Emmalina]

Been on the boat since I bought it 15 years ago and having a clear out found these things ! Still no idea what they are for ???

[Franziska]

Hmm. Could you please write what's written on there (I can't quite decypher it)?
Might be a better start for searching.

There is a company called Hemel in Germany, but they have nothing to do with boats. Still sometimes parts get used "off-label" or repurposed. https://www.hemel.de/ueber-uns

Are the parts related?
One of each?
Is the dish on the first part rotating around the rusty screw?
I think the screw is centered. The off-center imprint in the disk might be just from manufacturing.
The groove in the disk indicates perhaps that a wire or line went around it...

[Emmalina]

Hemel 742881-1 I think

[Franziska]

Hmm, I did research but did not find anything. Maybe someone else has some ideas..
Good luck!

[psk125]

The Hemmel thing looks like it should be a temporary fitting since the screw tightens it in place onto a stick or stanchion of some sort. What would it slip over on board that it could then tighten up on? Cleat ends or posts somewhere? Perhaps for rigging a fishing line off the stern or for keeping a radar reflector halyard from chafing on the reflector? A retrieval line for a kellet? Lots of possibilities!

[newhaul]

Possible home gym stuff for long passages. Something like this but a DIY setup??

[MicHughV]

What makes you think it's a boat boat part ???

Those little red things are rusting....so unlikely to be a boat part, and the main body also appears to some kind of iron casting.

I got 2c sez it's not a boat part. It may have some other application and just ended up on the boat.

[MicHughV]

In closure, the main part seems to have an "offset" hole in the center, placed on a inner ring, but whether that can rotate or not I cannot say.
The " offset" hole must be a clue to it's use ??

[markiobe]

Originally Posted by Emmalina

Been on the boat since I bought it 15 years ago and having a clear out found these things ! Still no idea what they are for ???

The third one is, quite obviously, a garrotte. I'm guessing that sometimes they didn't like their guests and it's an easy way of freeing up a berth...

[Sun and Moon]

I suspected my neighbor of dropping a few rigging pins and rings on my deck, so I went to the local junkyard, bought a few things I had no idea what they were and dropped them into his cockpit lockers.

[smith8273]

Easiest way to find out what they are is to get them off your boat — then as sure as anything you will need them the very next day.

[Franziska]

Originally Posted by MicHughV

In closure, the main part seems to have an "offset" hole in the center, placed on a inner ring, but whether that can rotate or not I cannot say.
The " offset" hole must be a clue to it's use ??

It appears to be, but it is actually centric if you look carefully.