I'm looking at a listing for a ¼" to ⅝" screw adapter, for which the seller warns that I should "please allow 1-3cm error".
A 3cm error would mean that a ⅝" screw could result in a screw thread anywhere between 1⅘" and... minus half an inch, I guess? (I don't even know how to make the concept of negative lengths fit into my brain.)
I suppose this seller could send me an empty envelope and declare that it contained an infinitesimally small adapter. At which point... I'd be the one that was screwed!
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Highlighted item description from an eBay listing. The highlighted section shows that the listing is for a quarter inch to a five-eighth of an inch adapter made of a premium aluminium alloy, and that the buyer should "please allow 1-3cm error due to manual measurement".
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