Item Type: Binding Spine Inner Diameter: Approx. 12mm/0.47 inch Number of Holes: 34 Holes Number of Binding Pages: 12mm . 2. Plastic Material: Made of high-quality plastic material, it is reusable and lightweight, with good toughness, wear resistance and aging resistance, and has a long service life. 3. Good Durability: These binding rings have good surface gloss, strong adhesion, and are not easy to break or fade, so they can easily bind papers and keep them for a long time. 4. Easy to Install: Just punch appropriate holes in the paper for manual binding, suitable for office, school or home use, convenient and practical. 5. 10 Pieces in 1 Set: Includes 10 binding rings, sufficient quantity, convenient to use and replace, detachable split design, can be easily opened and closed at any time. 10 x Binding Spine Note: All data are manually measured, please allow 1-3 cm error due to the difference in light and monitor, there may be some color difference, please refer to the actual item received.