1、Easy 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. 2、90 Sheet Capacity: This spiral binding coil is 17mm (1/2in) in diameter and can hold up to 90 sheets of paper (A4, 70g), making it easy to add and subtract sheets. 3、4:1 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. 4、360 Degree Rotation: This binding spirals ring can be rotated 360 degrees which makes it easier to read, and the binding items can lay flat. 5、Multifunctional: This combs spines coil is multifunctional and is perfect for engineer files, business projects, office documents, and university presentations. 100 x Binding Spirals Item Type: Binding SpiralMaterial: PVCBinding Diameter: Approx. 12.7mm / 1/2in Binding Capacity: 90 Sheets (A4, 70g)Teeth Number: 48 TeethRatio: 4:1