These barrel clasps have a built-in security screw lock and are very durable and easy to screw together.These screw clasps are perfect for repairing your existing jewelry or creating homemade jewelry, necklaces, anklets, charm bracelets or any craft/fashion project. They have a beautiful and shiny look that makes your jewelry look shiny.Each screw clasp measures approximately 4mm x 15mm. They are the perfect size. Each clasp has an open loop at each end. These jewelry clasps hold the two ends of a necklace or bracelet together by screwing the two items together to form a barrel shape.Color: SilverSize: 15*4mmProduct List: 50*Necklace Connecting Clasp Accessories