Good quality rings true to size. (Note that 10 mm = 25/64 inches.) This is small. Several people gave these rings low ratings because they obviously didn't realize how small 10mm is. Also, they are not designed to "hold keys". Rather, they are designed to attach accessories to a larger keychain. Such accessories can include keychain-sized knives and garage door openers. (Such items often come with inferior "chains" that soon fail.) These rings are a much better solution and can be linked into a chain if needed.
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