Feature: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 or 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).Specification:Item Type: Spiral Double Loop Wire Binding RingsMaterial: Iron, nylon.Binding Diameter: Approx. 14.3mm or 0.56inBinding Capacity: 120 sheets (A4, 70g)Teeth Quantity: 34 teethRatio: 3:1Package List:100 xComb Binding Spine