Durston 1312 Quad Jump Ringer Jura by GRS Swiss made by Glardon-Vallorbe to

Swiss made by Glardon-Vallorbe to professional standards

held in place by cast-in slots

Oval form factor sized to the listed stone dimensions

then polished to a flawless mirror finish

Mountings are supplied in standard USA ring sizes 6–6½

Durston 1312 Quad Jump Ringer Jura by GRS Swiss made by Glardon-Vallorbe toThe Durston 1312 Quad Jump Ringer is a professional jump ring making machine designed for jewelers and metalsmiths who need to mass produce jump rings efficiently. Compatible with a Foredom No. 30 style handpiece and flex shaft machine, this system lets you produce jump rings from soft, non ferrous jewelry wire including gold, copper, and silver. Wire as thick as 13 gauge (1. 85 mm) can be used, and the inside diameter of finished rings ranges from 2.