Metric Knitting Needle Gauge RingCrocheters and knitters alike will appreciate this sterling silver ring. Hook sizes are inconsistent, but metric will never let you down, and neither will this ring. Wear it in style, and use it to check the size of that errant hook or needle (sizes 2. 0, 2. 25, 2. 75, 3. 25, 3. 5, 4. 0, 4. 5, 5. 0mm). The ring is approximately 7. 5 8mm wide and 1. 5mm thick, a comfortable fit for most fingers (each ring is made by hand, and due to the nature of