A Guide - Crochet Hook Sizes by Craft Yarn Council

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As a result of innovation, yarn trends and globalization, the variety of hook and needle sizes and the materials with which they are made has grown over the years. U.S. needle and hook manufacturers continue to use both numbers and/or letters as well as metric sizing (millimeter/mm) on hook and needle packaging. Because letter and number sizing vary from company to company, rely on the package millimeter (mm) sizing, which is an accurate measurement.

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