Amazon.com: Size 13 Circular Knitting Needles 16 Inch Set Round Metal Kit
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Knitting Needle Sizes and Conversion Chart (Free Printable) - Sheep and Stitch
Amazon.com: 32"Size 13 (9mm) Circular Knitting Needle for Beginners, Stainless Steel Circle Knitting Needles with Fixed Lace Cord, Round Metal Knitting Needles with Magic Loop for Sock, Blankets, Sweater, Gloves