[Efficient File Organization] The metal ring set includes 15 pcs of 4-inch loose leaf binder rings, ideal for organizing loose-leaf binders, memos, index cards, receipts, keychains, and sample folders securely and neatly for quick access. [Extra-Large Size] Each nickel-plated steel binder ring features a 4-inch inner diameter and a 4.3-inch outer diameter, providing ample space 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 metal rings are built to resist rust and fading. Precision cutting and polishing ensure a smooth finish and clean appearance suitable for professional use. [Simple and Secure Use] Designed with an easy-to-open clasp mechanism, the large binder rings open and close smoothly while maintaining a secure lock to prevent accidental opening, keeping your materials safely contained. [Multipurpose Application] These loose leaf binder rings are suitable for use with binders, memos, cookbooks, photos, sample books, contracts, marketing materials, and craft projects. They are also great for organizing keychains at the office, classroom, or home. Size: 4-inch inner diameter, 4.3-inch outer diameter Color: Silver Material: Metal Package Contents: 15 x 4-inch loose leaf binder rings Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3 cm.