Size: about 18mm in diameter, 4.5mm thick, hole: 3mm,8pcs in total.which are designed for jewelry making and could match with most necklaces and other styles of accessories. 24K Gold Plated Material:These spring ring clasps are made of 304 stainless steel, Real 24K Gold Plated,hand the high quality material makes these clasps hard, not easy to break, not easy tarnis, for long-lasting wear. Feature: Pushes buckle, easy remove, strong spring ring clasps create a strong hold to ensure clasps stay connected throughout the day. Attractive and easy to fasten.No more fumbling with clasps like lobster clasps. Easy To Use:The round clasp set is not only suitable for repairing broken bracelets, but also has the additional usage of fixing the necklace when you lack the loop, which can make your necklaces and bracelets become complete again Widely Use: This spring ring clasp is most commonly used on necklaces and anklets.create an adjustable necklace or bracelet; Also perfect for repairing your existing jewelry or creating homemade jewelry.