2 Sizes: about 10-12mm long, 2-2.5mm thick, hole: 2-3mm, each size 5pcs, 10pcs in total in box, packaged well. Great for DIY your special & unique jewellery, excellent for suspending small items. 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: These steel spring ring clasps are a convenient substitution for other types of clasps. The closure of spring ring clasps is very easy to push and fit for most jump rings and chain. Stainless Steel Clasps: These clasps are made of 304 stainless steel, hand the high quality material makes these clasps hard, not easy to break, not easy tarnis, for long-lasting wear. Widely Use: Suitable for the leather, satin cord necklaces and other stringing materials to create an adjustable necklace or bracelet; Also perfect for repairing your existing jewelry or creating homemade jewelry.