Features: brand new and high quality. DURABLE MATERIAL: Made of high quality alloy metal, strong and durable, simple. EASY TO USE:Each one comes with a separate jump ring, so you don'for t have to put for extra effort to open before connect something on it.Convenient for you to attach charms on to it,easy to install to make your DIY project simple. PACKAGE INCLUDES: 100pcs in total. for Key rings with chain open jump rings and screw eye pins. SIZE DETAILS:The split ring size, approx 0.85''(21mm) in diameter with 0.98"(25mm) extension chain, the open jump ring is 0.24" (6mm) in diameter and the screw eye pin is 0.39''(10mm). SUITABLE FOR DIY: The for key chain making supplies are perfect for keychain blanks, keychain mold, screw in keychain, make for phone, bag, purse, and other accesspries. Specifications: Material: Alloy Diameter: approx 21mm/0.85 inches Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 100x Flat for Key Rings