1、170 Sheets Capacity: The spiral binding coil has a diameter of 19mm and can accommodate up to 170 sheets of 70g A4 paper, making it easy to add and reduce paper. 2、4: 1 Pitch and 48 Loops: The spiral binding coil has a 4:1 pitch and is compatible with any binding machine with 4 holes per inch. The 4:1 Pitch Ratio of these binding coils allows for easy insertion of pages and provides a clean finish to your bound documents. 3、100pcs in Total: A total of 100pcs spiral binding coils ensures the long term productivity of all your binding items, allowing you to easily bind paper and store it for a long time. 4、360 Degree Rotation: The spiral binding coil allows for a 360 degree page rotation function, making it easier to read, and the binding items can be placed flat. 5、Applicable Size: These 48 loop binding coils are very suitable for letterhead size paper of 8.5 x 11in, and the length can also be cut with scissors according to your requirements. Very suitable for engineer files, commercial projects, office documents, and university presentations.