Usage Tips:[Efficient File Organization] The metal ring set includes 15pcs 4 inch loose leaf binder rings, perfect for keeping loose-leaf binders, memos, index cards, receipts, keychains, , and sample folders securely grouped and neatly organized for quick access.[Extra-Large Size] Each nickel plated steel book keychain features a 4Inch inner diameter and a 4.3Inch outer diameter, offering plenty of room to hold thick stacks of documents, making file storage and management easier and more efficient.[Heavy-Duty Construction] Made from strong nickel-plated steel, these key metal rings are built to resist rust and fading. Precision cutting and polishing give metal paper rings a smooth touch and a clean appearance for professional use.[Simple and Secure Use] Designed with an easy-to-open clasp mechanism, the large binder rings open and close smoothly while providing a firm lock that ' open unintentionally-keeping your materials secure at all times.[Multipurpose Application] The loose leaf binder rings are suitable for binders, memos, curtains, , cookbooks, photos, sample books, contracts, and marketing materials. These metal rings for index cards also work great for craft projects, keychains at the office, study, craft creation and many other occasions.Size:4Inch Diameter, 4.3Inch Outer Diameter Color:SilverMaterial:MetalPackage Contents:15 * 4 inch loose leaf binder ringsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.