Feature 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.Item Type: Binding SpiralMaterial: PVCBinding Diameter: Approx. 12.7mm / 1/2in Binding Capacity: 90 Sheets (A4, 70g)Teeth Number: 48 TeethRatio: 4:1 .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List100 x Binding Spirals