Features: 12mm ring diameter, 9.5mm ring distance, can hold about 85 sheets paper. Cylindrical ring design, easy to turn pages and protect paper. The length of binding can be cut. Suitable for 6,9,20,26,30 hole notebook binding. The binding can be used for A4, A5, A6, A7, B5 papers binding. Specifications: Ring Diameter: 12mm Ring Distance: 9.5mm Sheet Capacity: Can hold 85 sheets of paper Length(1pc): 28cm / 11.0in Notes: The use of this product may also require a hole puncher, it can punch paper and then bind the paper with these ring. Paper and puncher are not included. Color: Black Material: plastic Package Contents: 20 x Binding Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.