50pcs Metal Book Binder Rings 15-80mm Loose Leaf Hoops Keychain Office Binding. These Durable, Silver-tone Metal Loose Leaf Rings Are Perfect for Organizing and Securing Various Items. With an Outside Diameter of 20mm and a 2mm Thickness, They Are Designed to Easily Open by Pulling and Close by Squeezing. Ideal for Loose-leaf Books, Memo Filing, Key Rings, Scrapbooking, and Sample Holding, These Rings Accommodate Punched Materials Effortlessly. Key Features: - Material: Metal - Color: Silver Tone - Outside Diameter: 20mm (0.8 Inches) - Inside Diameter: 16mm (0.63 Inches) - Thickness: 2mm (0.08 Inches) - Net Weight: 74g - Easy to Open and Close Mechanism - Versatile Use for Various Organizational Needs - Package Includes 50 Rings (with a Possible Variation of +/- 2%) Note: Due to Lighting and Display Differences, the Item's Color May Slightly Vary from the Images. Measurement Error Allowance is +/- 1-3cm.. Your order tracking code will be sent on shipping and takes up to 5 days to show live information.