Convenient Packaging: Each pack includes 20 pieces of loose leaf binders book rings, providing ample quantity for creating multiple notebooks and reducing the need for frequent repurchases. You'll have enough to fulfill your needs and share with family or friends. Versatile Size: With a general size of approximately 1.57" x 0.98" (40mm x 25mm) and an inner diameter of 0.98" (25mm), these metal loose leaf binders are suitable for most books and albums. Their size makes them ideal for various DIY projects, including travel diaries, photo albums, scrapbooking, loose-leaf notebooks, and graduation alumni books. Reliable and Durable: Made of multi-layer stainless steel, these loose leaf binder rings are built to last. They are waterproof, rust-proof, and not easily broken, providing reliable performance even in demanding environments. Flexible and Secure: These 3 Rings Metal Loose Leaf Binders feature a well-designed split design, allowing them to be easily split into 2 halves and securely connected with a metal swivel rivet. This ensures that the book binders lock safely and tightly, preventing any loose pages or scattered papers. Wide Range of Applications: These flexible and versatile metal loose leaf binders can be easily expanded and closed, offering endless possibilities for organizing and creating. Use them for DIY travel diaries, photo albums, scrapbooking, loose-leaf notebooks, and more. Their sturdy construction ensures they can withstand heavy use in office, classroom, or home settings.