Features： 1、Coil Specifications: These binding coils have a diameter of 25.4mm (1 inch), and for adding and subtracting paper, with 215 sheets binding capacity. 2、360 Degree Rotation: These spiral binding spines allow for 360 degree page rotation, and the binding items can be placed flat to ensure convenient reading. 3、Standard 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. 4、Applicable 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. 5、Wide Application: Includes 35pcs binding spines, for engineer documents, business projects, office documents, and university presentations. Specification： Item Type: Spiral Binding Coil Binding Diameter: 25.4mm / 1in Binding Capacity: 215 Sheets (A4, 70g) Number of Loops: 48 Loops Pitch: 4: 1 Package List： 35 x Spiral Binding Coils