My favorite crochet hooks are Clover aluminums and Hamanaka hooks. I am constantly double checking the conversion between Japan and US crochet hook sizing. I finally broke down and made a chart for myself. So
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Crochet Hook Conversion Chart - metric, US letter and number and UK old sizes
Crochet Hook Conversion Chart - metric, US letter and number and UK old sizes
Crochet Hook Conversion Chart - metric, US letter and number and UK old sizes
Crochet Hook Conversion Chart - metric, US letter and number and UK old sizes
Crochet Hook Size conversion chart - Crochet for beginners
The Ultimate Crochet Hook Conversion Chart (US, UK, Japan!) Crochet hook conversion chart, Crochet hook conversion, Crochet hooks
Crochet Hook Sizes Everything You Need To Know Crochet 365, 40% OFF
Crochet Hook Conversion Chart - metric, US letter and number and UK old sizes