Screw-in Locking Magnetic Jewelry Clasps High Quality Material: Leadcadmium free brass and nickel release free. Locking Holding: The built-in magnet has firmly holding strength to keep jewelry secured. Add On Length: The clasp converter connector adds an extra length to the jewelry.Safer Than Magnets Alone The magnetic clasps are drawn together easily when you bring them near to each other making it easier to put your jewelry on either from the front or the back. This magic magnetic clever clasp is a handy for those having long nails or suffering from arthritis. The magnetic lobster clasp have a screw on on the ends. Simple with security and it locks securely to keep your jewelry intact. Easy to use.Maintenance Instructions Easy to damage when exposed to chemicals. The aroma of bathing the chlorine in swimming and the salt in the sea water will accelerate the fading or damage. Therefore all accessories should be removed before bathing or swimming. Especially in the hot summer the coating is easily eroded by long-term exposure to sweat so it is best to prepare multiple pieces for frequent replacement. High Quality Material: Leadampcadmium free brass and nickel release free Firmly Holding: The built-in magnet has firmly holding strength to keep jewelry secured Add On Length: The clasp converter connector adds an extra length to the jewelry. Package Included: The pack includes 8pcs of magnetic clasps 4pcs goldtone and 4pcs silvertone Size: Diameter 6mmsuitable for different types of necklaces