Check the listing for details. 4.5mm 14k MAGNETIC CLASP TINY Converter Extender Yellow SOLID Gold USA MADE. Color: Yellow, Condition: New with tags. Listed at 35.95 USD. THESE ARE VERY SMALL!!! This clasp is: 4.5mm diameter X 10mm, NO Spring Ring Clasp with this listing a dime coin is 17.5mm In our opinion, suitable for chains up to 25grams. You be the judge for yourself. No hassle returns. It is strong enough to hold one side & slide all around the Nickel without it even starting to come apart. Other clasps WILL be slightly attracted to a strong magnet, as their internal springs are steel. NOT responsible for any losses due to clasp failure. USE AT YOUR OWN RISK if you use a PACEMAKER, INSULIN PUMP, OR DEFIBRILLATOR etc...Thanks Weight: 0.56grams each 14k White Gold are listed, item # 153394924219 & Rhodium Plated 153411260862. DO NOT clean Magnetic Claps in ULTRASONIC cleaners as it will reduce the strength of the magnets.