Feature:1. 75 SHEET CAPACITY: The plastic spiral binding coil has a diameter of 9.5mm and can hold up to 75 sheets of paper(A4, 70g), easy to add and reduce paper2. 4:1 PITCH AND 48 RINGS: The spiral binding coil has a 4:1 pitch and is compatible with any binding machine that punch 4 holes per inch3. 100PCS IN TOTAL: A box of 100 spiral binding coils ensure long term productivity for all your binding projects, allowing you to easily bind paper and store for a long time4. 360 DEGREE ROTATION: Plastic spiral binding coils allow a 360 degree page rotation function for easier reading, and binding items can be laid flat5. APPLICABLE LETTER SIZE: These 48 ring binding coils are ideal for letter size paper(8.5in x 11in), and the length can also be cut with scissors according to individual requirements. Perfect for engineering documents, business projects, office documents, university presentationsSpecification:Item Type: Spiral Binding CoilsBinding Diameter: 9.5mm(3/8in)Binding Capacity: 75 Sheets(A4, 70g)Teeth Quantity: 48 TeethRatio: 4:1.Package List:100 x Spiral Binding Coils