QUANTITY YOU WILL GET: Package includes 600pcs keychain rings sets, which contains 200pcs keychain rings, 200pcs open jump rings and 200pcs screw eye pins. All three parts are matchable. MATERIAL WE ADOPT: Made of good quality metal, non-toxic and rust-proof, durable and sturdy. With smooth surface and edges, it will be safe to use, stay securely closed and will not be separated. PRODUCT DIMENSION: Keychain Rings- 1\"/ 25mm in diameter, 1.8\"/ 46mm in length; Screw Eye Pins- 4mm in diameter, 0.4\"/ 10mm in length. Please allow 0.1 inch mistake due to the different measurement unit and manual measuring. PORTABLE FOR USE: Lightweight and portable to carry out, also a good sortment helper for your daily life. If you are still bothered by different keys of your home or office, our keychain rings are a best organizer. WIDE APPLIED FOR: These key rings bulk with chains and connectors are convenient for you to attach charms, also comes with screw eye pins, which can be inserted in dolls.