1、High Paper Capacity: These double loop binding rings can hold up to 120 sheets of paper (A4, 70g), accommodating your sizable binding needs. 2、Metallic Inner Wire: The binding wires are made from high strength metallic iron, solid and durable, allowing you to easily bind papers together for long term storage. 3、Nylon Coating: The wires feature an external nylon coating, offering good surface gloss, corrosion resistance, and wear resistance for prolonged usage. 4、Perfect Size: Each binding spine has a diameter of 9/16 of an inch and a thickness of 0.8mm. Each spine has 3:1 pitch and has 34 double loops, allowing 360 degree rotation. 5、Application: Used to bind important documents, files, or reports for your upcoming presentations or projects. Compatible with most wire binding systems (3:1 pitch and 34 hole pattern). Item Type: Spiral Double Loop Wire Binding Rings Material: Iron, nylon Binding Diameter: Approx. 14.3mm / 0.56in Binding Capacity: 120 sheets (A4, 70g) Teeth Quantity: 34 teeth Ratio: 3:1 100 x Comb Binding Spine