I've no idea what it's for. I feel it might be for opening can lids like on tins of golden syrup but that's just a guess.

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Opinion
8Opinion
A couple people already said it, but here’s a brief demonstration.
I'm going to assume this video covers my assumption lol
As others have said, it's to lever open the pull tabs on a soda or beer can, without having to use your fingernails. Flip the tool over and slide the flat blade under the pull tab and lever it open.
Can opener. You slip that under the pop top tab and push down on the part of the opener that's hanging over the edge of the can and that lifts the tab up.
I'm not sure, I've never seen it before. But I think you might be right, probably some kind of bottle opener.
Looks by the wedge shape and direction on the end, it pulls up tabs on cans.
That piece is for your thumb, so you can use it as leverage to use the pressure to open the bottles
Isn't it for opening ring pulls on cans.
It is for tin lids.
it looks like a key...
Yes, or maybe it us a screwdriver
Pulltabs on pop cans.
No idea
Lunchboxes?
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AI Opinion
You’ve guessed it really well 🙂
That flat, slightly hooked bit is designed to help lift ring‑pull can lids. You slide the lip under the ring, then use the handle for leverage so you don’t strain your fingers.
I’ve had a similar keyring on my keys for years; it opens bottles, but it’s also great for stubborn soda or beer cans on picnics 🍺✨