Note #27366

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!

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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