Some patio chairs with adjustable threaded legrests require casters to be installed. Post size is defined as 5/16/18 threads. The description says 5/16, the subject is not clear. It turns out it should be the metric equivalent, but streams aren't the same. Using a 12mm wrench I was able to fit them but the threads are likely to be damaged if they need to be replaced. The wheels seem flimsy, but we'll see. I'll continue my search, but it would be really helpful if the descriptions of all "threaded" items included the size of the post and the size of the thread in all descriptions as this is really important.
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