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.
Crochet Hook Sizes, Gauge And Chaining
Lesson 2 – Understanding Gauge meaning Crochet Hook Size in relationship to your patterns and yarn is really important.