Description: Material: Copper, Magnetic Length approx. 40mm/ 1.57& 39;& 39;; Diameter approx. 8mm/ 0.31& 39;& 39;,Bell Inner Dia: Approx. 3mm/0.12& 39;& 39;, These magnetic clasps with both sides bell, easy to install and disassemble. Great DIY magnetic clasps findings for necklaces, bracelets, earrings and other fashion accessories making; Magnetic Clasps are attractive and easy to fasten clasps for necklaces and bracelets compare to traditional jewelry clasps. Package Includes: 5 Pieces Magnetic Clasps(4 Pack) Note: Since the size above is measured by hand, the size of the actual item you received could be slightly different from the size above. Meanwhile, please be reminded that due to lighting effects, monitor& 39;s brightness / contrast settings etc. there could be some slight differences in the color of the pictures and the actual item.