Durable and beautiful chain maille supplies by Weave Got Maille are some of our favorite jewelry findings, and these 20-gauge jump rings are no exception. With a 3mm inner diameter (I.D.) and a 4.6mm outer diameter (O.D.), these are good for when you want a small jump ring. The large array of vivid colors gives you plenty of options for creativity. Best yet, these jump rings are made in the USA using a combination of copper wire and an enamel coating that makes these chain mail rings easy to manipulate and hard to scratch. The enamel finish is more reliable than anodized colors. Sizes follow the American Wire Gauge (AWG) system of measurement.