Advantage: The spiral binding coils are made of long-lasting, strong plastic to ensure long-term productivity for all your binding projects, allowing you to easily bind papers and preserve them for a long time.Application: These plastic spiral binding coils are suitable for various office occasions and provide great convenience for file storage, file binding, paper collection, etc. It is a portable product for office and study.Specification: Inner diameter: 12mm/0.5 inch; Length: 279mm/11 inch; Coil spacing: 3:1; Number of binding pages: 85; Material: plastic; Color: Light Pink; Packing List: 50 Pcs Plastic Spiral Binding CoilsInstruction: Spiral binding coils have a 3:1 pitch, making them Suitable for any binding machine that punches 3 holes per inch. Binding spirals provide a 360-degree page-turning rotation capability for easier reading.Note: These 3:1 pitch binding coils are not Suitable for machines.