Hook manufacturers use both numbers and/or letters and metric sizing on hooks and needle packaging. Sizes are given in one or both ranges - millimeter or US number range.Ĭrochet hooks range in size from smaller B-1 (2.25mm) used for finer yarns to larger T/X (30mm) hooks used for heavier bulky weight yarns or several strands of lighter yarn used together. Steel hooks are sized differently than regular hooks - the higher the number, the smaller the hook, which is opposite regular hook sizing. Steel crochet hooks are typically used when working with crochet threads and lace-weight yarns. Crochet hooks range in sizes starting with tiny steel crochet hooks. Crochet (often confused with Knitting), is a needlework technique using a crochet hook and yarn or thread, various crochet stitches and sometimes a crochet pattern to create everything from delicate crochet doilies to afghans (blankets),amigurumi (stuffed animals), hats (beanies), shawls, cowls, dishcloths and more.