1、115 Sheet Paper Capacity: This spiral binding coil is 14.3mm (9/16in) in diameter and holds up to 115 sheets of paper (A4, 70g), making it easy to add and subtract sheets. 2、360 Degree Rotation: This spiral binding wire allows for a 360 degree page rotation feature for easier reading and binding items that lay flat. 3、4:1 Pitch: This PVC binding spirals ring has a 4:1 pitch and it is compatible with any binding machine that punches 4 holes per inch. 4、Excellent PVC Material: This binding spiral is made of excellent PVC material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. 5、Wide Application: This binding spine has a wide range of applications and is perfect for engineers' files, business projects, office documents, and university presentations.