Features:What you :You will receive 30 packs of white coil bindings spines in total, enough quantity to meet your work and study needs, you can also share with your colleagues or classmates.Practical tools:With our wire book binding spirals, you can add papers as you need and put your files in order and neatly, no worry about losing any important and easy to change papers, very convenient and creative.Specifications:Material: plasticColor: whiteSize: 12 inches in length, 8 mm/ 5/16 inch in diameterPackage includes:30 x Spiral binding coilsNotes:Manual measurement, please allow slight errors on size.The color may exist slight difference due to different screen displays. Large Binding Capacity: our spiral binding coils can hold up to 54 sheets of standard 20# copy , which is equivalent to the maximum binding capacity of 9/32 inches in thickness, and fits well for most office projects to improve efficiency and save binding costs Suitable Length: each plastic coil binding is 12 inches long, this suitable size is nice for letter-sized books, documents or binding projects, so you don't have to the problem that the coil is too short; In addition, the coil has a lot of extra parts, so you can curl the ends to pretty appearance 4: 1 Pitch: binding coils are with most 4: 1 coil binding machines and convenient to use; The coils are equipped with 48 loops for every 12 inches of coils, and their 4: 1 pitch the pattern of 4 holes per inch on the side of the book, easy to assemble Prefabricated Coils: these spine coils have a diameter of 8 mm/ 5/16 inch, which can improve durability and maintain strength, and provide you with long-term ; They are the first choice for easy binding of books, documents or reports in the office Reliable Plastic: spiral bind coils are made of quality plastic, safe and smooth, and can easily create binding projects that lie flat with our binding coils; With softness and flexibility, their structure will not bend or jam, making your business proposals, reports, menus and more look neat and elegant