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Figuring out hook sizes can be confusing. In the U.S., a combination of letters and numbers are used, but the English and most other countries use a metric numbering system. On top of that, there is a separate numbering system for steel hooks that are used for thread and lace crochet. And, even though this all sounds like there's a uniform system for sizing crochet hooks, unfortunately, one company's hooks aren't necessarily the same sizes as another company's! This is why you might want to consider buying a set of hooks from the same manufacturer and why you should take the time to make a gauge swatch -- getting the correct gauge for a pattern is always better than having the "right" hook size.