1280 SHEET CAPACITY: The plastic spiral binding coil has a diameter of 32mm and can hold up to 280 sheets of paper (A4, 70g), allowing easy addition and removal of pages. 24:1 PITCH AND 48 TEETH: The spiral binding coil has a 4:1 pitch and is compatible with any binding machine that punches 4 holes per inch. 3SET OF 20: 20 spiral binding coils in the package, ensuring long term productivity for all your binding projects, making it easy to bind and store papers for a prolonged period. 4360 DEGREE ROTATION: The plastic spiral binding coil allows for 360 degree page flipping, making it easier to read and allowing projects to lay flat. 5SUITABLE FOR LETTER SIZED PAPER: These 48 teeth binding coils are perfect for letter sized papers (8.5 inches x 11 inches), and the length can be easily cut with scissors as per individual requirements. Ideal for engineering documents, business projects, office documents, and university presentations. 20 xPlastic Spiral Binding Coils