Features 115 SHEET CAPACITY: The plastic spiral binding coil has a diameter of 14.3mm and can hold up to 115 sheets of paper(A4, 70g), easy to add and reduce paper 4:1 PITCH AND 48 RINGS: The spiral binding coil has a 4:1 pitch and is compatible with any binding machine that punch 4 holes per inch 100PCS IN TOTAL: A box of 100 spiral binding coils ensure long term productivity for all your binding projects, allowing you to easily bind paper and store for a long time 360 DEGREE ROTATION: Iron spiral binding coils allow a 360 degree page rotation function for easier reading, and binding items can be laid flat APPLICABLE LETTER SIZE: These 48 ring binding coils are ideal for letter size paper(8.5in x 11in), and the length can also be cut with scissors according to individual requirements. Perfect for engineering documents, business projects, office documents, university presentations Spec: Item Type: Spiral Binding Coils Binding Diameter: 14.3mm(9/16in) Binding Capacity: 115 Sheets(A4, 70g) Teeth Quantity: 48 Teeth Ratio: 4:1 How to Use: 1. Remove the product from the packaging. 2. Install the product. 3. Once installed, it is ready for use. packing list: 100 x Spiral Binding Coils Package List 100 x Spiral Binding Coils