this post was submitted on 09 Feb 2026
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What is this thing?
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Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
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It looks like a small C spanner.
There should be a nut or something else you need to turn with a notch or series of notches cut into the outer face which this will grab onto as you pull it around the part.
Definitely a C-spanner. The sort of thing that's used to adjust a motorbike shock's preload.
This looks cheap and disposable, possibly supplied as part of a kit for something rather than bought as a standalone tool.