HooAMI Stainless Steel Rhinestone Crystal Magnetic Clasp for Bracelet Necklace Jewelry - Fit 5mm Cord Material:Stainless Steel Quantity:1 piece Length:17mm( 5/8");Outside diameter:10mm( 3/8");Inner diameter:5mm; Magnetic clasps appeal is very strong and wouldn't fall off Fit for jewelry making and crafting:bracelet, necklace and another DIY project