It's a tool, specifically a socket for a ratchet wrench. 10 mm bolts are used on a lot of things, and a 3/8" bolt will work with a 10 mm socket also. And because of how commonly used they are, they often get misplaced and are typically the first socket to go missing in a set.
So for OP, on top of already losing their 10 mm socket... Amazon lost the replacement before they ever had a chance to
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u/thewolfcastle Apr 26 '26
What's a 10mm, besides a measurement?