4mm Open Jump Rings 21 Gauge Silver Plated (100) A handy, all-purpose-size jump ring, plated in genuine Silver. Use for the female half of clasps, hooks & other fasteners. Fasten large hooks onto the ends of chains. Suspend pendants from necklaces, earrings, anklets, bracelets, collars.... Why pay up to 20 cents per ring for solid sterling? These Sterling Silver Plated jump rings give you the same quality look at a great price. 4mm outside diameter, 21 Gauge, or .032 inches thick. Quantity: 100 jump rings per lot.