Feature: 1. 140 Sheets Capacity: This spiral binding coil is 16mm (5/8 inch) in diameter and can hold up to 140 sheets of 70g A4 paper, making it easy to add and subtract sheets. 2. 360 Degree Rotation: This spiral binding spine allows for a 360 degree page turn rotation which is easier to read, and the binding items can be laid flat. 3. 4 : 1 Pitch: This binder combs spine features a 4 : 1 pitch and is compatible with any binding machine which can punch 4 holes per inch. 4. Excellent PVC Plastic: This binding spine is made of excellent PVC plastic material, which is sturdy and wear resistant, not easy to be deformed, and has a long service life. 5. Wide Application: This binding spiral has a wide range of applications and is perfect for engineers' files, business projects, office documents, and university presentations. Specification: Item Type: Spiral Binding Coil Material: PVC Plastic Binding Diameter: 16mm (5/8in) Binding Capacity: 140 Sheets (A4, 70g) Teeth Number: 48 Teeth Ratio: 4:1. Package List: 100 x Spiral Binding Coils