4.5mm spring rings are about as small as any jewelry comes with. 6mm spring rings come on item 265158506468.4.5mm diameter X 20mm, 4.5mm Spring Ring clasp 3/16" X 3/4" a dime coin is 17.5mm. In our opinion, suitable for chains up to 25grams. You be the judge for yourself. It is strong enough to hold one side & slide all around the Nickel without it even starting to come apart. Spring ring and other clasps WILL be slightly attracted to the magnet, as their internal springs are steel.
Rest assured these are solid 14k. NOT responsible for any losses due to clasp failure. USE AT YOUR OWN RISK if you use a PACEMAKER, INSULIN PUMP, OR DEFIBRILLATOR etc...14k White Gold are item 153394921198 & Rhodium Plated 153411261524. The item "3 4.5mm 14k MAGNETIC DOUBLE CLASP Converter Yellow SOLID Gold Spring Ring USA" is in sale since Monday, December 17, 2018. This item is in the category "Jewelry & Watches\Jewelry Care, Design & Repair\Jewelry Findings". The seller is "jewelrymaven-net" and is located in San Tan Valley, Arizona. This item can be shipped worldwide.