1Easy To Use: This spiral binding wire is very easy to use, you just need to insert your papers into the teeth of the spiral binding coils and use a coil binding machine to secure them in place. 290 Sheet Capacity: This spiral binding coil is 12.7mm (1/2in) in diameter and can hold up to 90 sheets of paper (A4, 70g), making it easy to add and subtract sheets. 34:1 Pitch: This binder combs spine features a 4:1 pitch, 48 rings and is compatible with any binding machine that punches 4 holes per inch. 4360 Degree Rotation: This binding spirals ring can be rotated 360 degrees which makes it easier to read, and the binding items can lay flat. 5Multifunctional: This combs spines coil is multifunctional and is perfect for engineer files, business projects, office documents, and university presentations. 100 xBinding Spirals