Features SIZE & CAPACITY - The spiral binding coil has a diameter of 5/8" (16mm). and can accommodate up to 140 sheets of paper (A4, 70g), making it easy to add and reduce paper. Spool Specifications: These spiral binding spines have a unique wire design and 48 loops, with 4:1 pitch, which is compatible with any binding machine with 4 holes per inch. Durable material: these single wire binding coils are made of excellent metallic material, sturdy and durable, allowing you to bind paper easily and store it for a long time. Convenient use: these paper binding spines support 360 degree page turning function, which makes its binding elements flat and easy to read, which improves work efficiency. APPLICABLE RANGE - Includes 100 pieces spiral binding coils, suitable for 8.5 x 11 inch paper, can be cut as needed, used for binding engineering documents, office files, etc. 1. SIZE & CAPACITY - The spiral binding coil has a diameter of 5/8 inch. ), can accommodate up to 140 sheets of paper (A4, 70g), making it easy to add and reduce paper. 2. Spool Specifications: These spiral binding spines have a single wire and a 48 loop design, with a 4:1 pitch, which is compatible with any binding machine with 4 holes per inch. 3. Durable material: these single wire binding coils are made of excellent metallic material, sturdy and durable, allowing you to bind paper easily and store it for a long time. 4. Convenient Use These paper binding spines support 360 degree page turning function, which makes its binding elements flat and easy to read, which improves work efficiency. 5. Applicable range: Includes 100 pieces spiral binding coils, suitable for 8.5x11 inch paper, can be cut as needed, used to bind engineering documents, office files, etc. Specification: Item Type : Spiral Binding Spines Binding Diameter: 16mm (5/8") Binding capacity: 140 sheets (A4, 70g) Number of loops: 48 loops Ratio: 4:1 How to use: Take out the product, install it and use it. Packing List: 100 x Spiral Binding Spines < /p> Package List 100 x Spiral Binding Spines