This crochet hook sizes conversion chart compares metric (mm) measures to US terms. A printable version of the chart is available.
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Free Printable Crochet Hook Conversion Chart - Pretty Darn Adorable
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Conversion Charts for Knitting Needle & Crochet Hook
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Crochet Hook Sizes, rickabamboo.com, #learntocrochet #crochet
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Crochet Hook Conversion Chart