This jump ring can be used in the following chain maille techniques: European 4-in-1, Japanese 12-in-2 (also requires 19 gauge 3.67mm inner diameter jump rings)
Outer diameter: 4mm (0.16 in)
Inner diameter: 2.47mm (0.10 in)
Thickness: 0.75mm (0.03 in) approximately 20.5 gauge
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