What size is most commonly used for crochet hooks?
The most commonly used hooks sizes range from 2.25 mm (B-1) to 19 mm or S, the largest. Most hooks come in 6" lengths. For fine work, such as crocheted lace and doilies, steel crochet hooks are used. They have a different sizing range, using numbers from 3.5 mm (00), the largest, to.75 mm (14), the smallest.
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