Screw-in Locking Magnetic Jewelry Clasps High Quality Material: Lead and cadmium free brass, nickel release free. Firmly Holding: The built-in magnet provides strong holding strength to keep jewelry secure. Add On Length: The clasp converter connector adds extra length to your jewelry. Safer Than Magnets Alone: The magnetic clasps easily draw together when brought near, making it easier to put on jewelry from the front or back. This magnetic clasp is convenient for those with long nails or arthritis. The magnetic lobster clasp features a screw-on design on the ends. Simple and secure, it locks firmly to keep your jewelry intact and is easy to use. Maintenance Instructions: Avoid exposure to chemicals as they may cause damage. Chlorine from swimming pools and salt from seawater may accelerate fading or deterioration. Remove all accessories before bathing or swimming. In hot weather, prolonged exposure to sweat may erode the coating; consider having multiple pieces for regular replacement. Package Included: 8 pcs magnetic clasps (4 gold tone and 4 silver tone) Size: Diameter 6mm, suitable for various necklace types