Great for connecting two jewellery components together such as a clasp to a chain or a pendant to a chain. To attach simply hold the jump ring on one side of the separation with your fingers and with needle nose jewellery pliers grip and twist the ring on the other side of the separation. Do not pull apart as this will ruin the shape of the jump ring. Thread the two components onto the jump ring and close buy twisting back with jewellery pliers.
Zart Art School Catalogue page: 181