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Steel hooks are usually the tiny ones that are used with crochet thread to make lace, filet crochet, or other small items. These hooks have their own numbering systems as well, with US, UK/Canadian, and metric sizes all being different. To give you a sense of the sizes, a size 13 (US) steel hook is a .75mm hook, which is the same as a size 7 (UK/Canadian) hook and is considered one of the smallest hooks available.