1. Coil Specifications: These binding coils have a diameter of 25.4mm (1 inch), and perfect 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, perfect for engineer documents, business projects, office documents, and university presentations.Spec:Item Type: Spiral Binding CoilBinding Diameter: 25.4mm / 1inBinding Capacity: 215 Sheets (A4, 70g)Number of Loops: 48 LoopsPitch: 4: 1How to Use:Take out the product, install and use.packing list:35 x Spiral Binding Coils