Package include: you will receive 12 pieces of round magnetic jewelry clasp, enough to meet you DIY need or share with friendsSize 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 braceletsConvenient 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 offSimple 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 itselfWide 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