Features: Flexible design: Each one is well-designed, namely, it can be split into 2 halves and connect with a metal swivel nail tightly; So the book binders lock safely and tightly enough. Reliable material: All the loose leaf binder book rings are made of premium metal, which are waterproof, rust-proof, and not easy to be broken. General size: the inner diameter of each ring metal loose leaf binder is about 20mm/0.79 inches, which is suitable for most books or albums size needs. Wide application: You can expand and close it easily; flexible design that you can use it to DIY travel diary, photo album, scrap booking, loose-leaf notebook and graduation alumni book. Vintage design: Bamboo joints shaped loose leaf binder is very for creative, elegant and retro, suitable for scrapbook, album and notebook binding. Specifications: Material: Metal Inner Diameter: Approx. 20mm/0.79 inches Color: Golden, Retro Dark Green, Red Gold Package Includes: 1 Piece 3 Ring Loose Leaf Binder 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.