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Not a riddle, except for me. We have two of them with garbage disposal tool and documentation. I knew at one time what it was for but now I can't remember. Obviously we have not needed it.
So what is it for?
Screwing and unscrewing
It fits into a ring of some kind in your sink's drain
Just guessing
https://www.amazon.com/Aerator-Removal-Aerators-Recessed-Wrenches/dp/B0D3DNX1P9/ref=asc_df_B0D3DNX1P9/?tag=hyprod-20&linkCode=df0&hvadid=702148693432&hvpos=&hvnetw=g&hvrand=12300134664146772399&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9008522&hvtargid=pla-2370323416687&psc=1&mcid=06df048d406031cfb364c048d697c6be&gad_source=1
Yeap, aerator wrench, most likely for your kitchen faucet.
Ha! I knew it was for something sink related.