When you are using a pattern that mentions a specific needle or hook, you will need a handy size conversion chart for knitting needles and crochet hooks!
24-inch(60cm) Flexible Afghan Cabled Hooks Kit (3 Free
Knitting Needle Sizes Explained + Printable Conversion Chart
Conversion Charts for Knitting Needle & Crochet Hook
Knitting needle conversion chart – Artofit
Crochet hook and knitting needle sizes and equivalents
Knitting Needle and Crochet Hook Size Conversion Chart
Conversion chart for crochet hooks - Craft-Mart
Yarn 101 Kristin Omdahl
Knitting Needle (& Crochet Hook) Sizing Chart [with yarn size
Gantsilyo Guru: Crochet Hook Conversion