Features: The 20mm can hold about 100 loose leaf papers, and the 30mm can hold about 180 loose leaf papers (optional). 3 ring metal loose leaf binders is easy to open and close, easy to install and use. With this binder rings, loose item such as paper can be easily organised. Book rings is suitable for loose leaves, memo filing, keychain key rings, notebooks, scrapbooks and so on. Metal binder rings that combine fashion and practical, just pull to open and squeeze to close, easy to use. Specifications: Component: Iron Size: about 20x2.4x40cm/7.87x0.94x15.75'' Size: about 30x2.4x40cm/11.81x0.94x15.75'' Type: 8 Kinds Optional Package Includes: 5 Pcs/Set Binder Clips note: Please allow 1-3cm errors due to manual measurement. Due to the difference betweeen different monitors,the picture may not reflect the actual color of the item.