Features： 1、280 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. 2、4:1 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. 3、SET 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. 4、360 DEGREE ROTATION: The plastic spiral binding coil allows for 360 degree page flipping, making it easier to read and allowing projects to lay flat. 5、SUITABLE FOR LETTER SIZED PAPER: These 48 teeth binding coils are 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. Specification： Item Type: Plastic Spiral Binding Coils Material: PVC Plastic Binding Diameter: Approx. 32mm / 1.26in Binding Capacity: 280 sheets (A4, 70g) Number of Teeth: 48 teeth Pitch: 4:1 Applicable Paper Size: Approx. 8.5 x 11in / 21.59 x 27.94cm Package List： 20 x Plastic Spiral Binding Coils