1Coil Specifications: These binding coils have a diameter of 25.4mm (1 inch), and perfect for adding and subtracting paper, with 215 sheets binding capacity. 2360 Degree Rotation: These spiral binding spines allow for 360 degree page rotation, and the binding items can be placed flat to ensure convenient reading. 3Standard 4:1 Pitch: These plastic spiral binding coils have a 4:1 pitch, which is compatible with any binding machine that punches 4 holes per inch. 4Applicable Paper: These 48 loops binding coils are suitable for letter size paper (8.5 x 11 inches), and the length can be cut according to your needs. 5Wide Application: Includes 35pcs binding spines, perfect for engineer documents, business projects, office documents, and university presentations. 35 x Spiral Binding Coils