Whether connecting a clasp to a chain or linking the rings together to create chainmaille jewelry, jump rings are one of the most versatile findings available for jewelry making. These base metal jump rings are made up of 18 gauge wire. The thick gauge of the this jump ring will withstand daily wear and tear on all your jewelry connections. For best results, we recommend using two pairs of chain nose pliers to open and close these rings. Jump rings measure 4mm.