This is a European 6-in-1 Chainmail Necklace, where each center ring links with 3 pairs of side rings. The length of the necklace is approximately 33 inches and is composed of 300 separate rings. The larger rings are .65 inches in diameter and the smaller rings are .5 inches in diameter, with all rings being 1.55mm thick.
I am currently working (painfully) on adapting this design to some bracelets. Hope to have them ready soon!