1. Material: plastic 2. The inner diameter of the 10mm hole can hold about 65 sheets of paper 3. The inner diameter of the 12 mm hole can hold about 100 sheets of paper 4. It can be turned over 360 degrees, and the turning is smooth 5. 9.5 mm standard spacing, widely compatible 6. Buckle lock design, not easy to fall off 7. Size: 42mm
