Features 【Coil Specifications】Binding spine with 3/8in binding diameter and 0.8mm thickness. Each spine is spaced 3:1 with 34 double loops and supports 360 degree rotation. 【Metal Inside Wire】The inside of the binding ring is made of wire, which is strong and durable, allowing you to easily bind your paper and keep it for a long time. 【Nylon Coating】These double-wire binding spines have a nylon coating on the outside that is glossy, abrasion-resistant, durable, and long-lasting. 【Paper Capacity】Holds up to 60 sheets of A4 paper, weighs 70 grams, and has a total of 100 double-coil binding spools that are easy to replace to meet your needs. 【Multi-purpose】These double wire spiral binding staples can be used to organize documents, files, reports and more and are compatible with most wire binding systems. Specification: Item Type: Double Loop Wire Binding Spine Binding Diameter: Approx. 9.5mm / 0.37in Binding Capacity: 60 sheets. A4, 70g. Loop: 34 Loop Pitch: 3:1 Package List:100 x Double Loop Wire Binding Spine Package List 100 x Double Loop Wire Binding Spine