Package include: you will receive 12 pieces of round magnetic jewelry clasp, enough to meet you DIY need or share with friends Size information: the diameter of the magnetic clasp is approx. 0.35 inch/ 0.9 cm, and the total length is 1.38 inches/ 3.5 cm, the appropriate size fits most necklaces and bracelets Convenient to use: the necklace extender has a magnetic latch and a lobster clasp, which is easy to install on the necklace and easy to put on and take off. (Some products may have weak magnetic properties, please test them when you receive them) Simple and decorative design: the shape of the magnet clasp is round, which can simply decorate your necklace without taking away the accessories of the necklace itself Wide usages: the magnetic extension chain is suitable for making jewelry, such as necklaces and bracelets, you can also send the finished products to your loved ones as gifts