Features： 1、[High Capacity] With a diameter of 16mm (5/8in), these binding spiral coils can hold up to 140 sheets of paper (A4, 70g), allowing for easy addition and removal of pages as needed. 2、[4:1 Pitch 48 Loop] These spiral binding coils are compatible with any binding machine that punches 4 holes per inch, ensuring a secure and professional binding. 3、[Set of 100] Each set contains 100 binding coils, ensuring long term productivity for all your binding projects, allows for easy and efficient binding of documents. 4、[User Friendly] The binding spirals allow for a 360 degree page flipping rotation, making it easier to read and allowing the bound documents to lie flat when opened. 5、[Versatile Usage] for engineering files, business projects, office documents, and university presentations, these sheet coils can be cut with scissors to match individual requirements. Specification： Item Type: Binding Spiral Material: Iron Binding Diameter: Approx. 16mm / 5/8in Binding Capacity: 140 Sheets (A4, 70g) Loop: 48 Pitch: 4:1 Package List： 100 x Binding Spiral