What's the biggest size for metal spiral single binding wire coil?

        What's the biggest size for metal spiral single binding wire coil?

        What's size of metal coil wire that you often use for notebook? as we know that there are 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, and 24mm etc. and the regular customers need white , black, sliver, and gold etc some colors.

         The most popluar color used recently is gold spiral binding coil. shiny and gorgeous surface of the wire coil is attracting. here is some of our products for reference.

        The biggest of metal binding coil is 50mm with 1.5mm wire diamater, but the biggest size wire coil after forming the pitch will be short then normal, due to the loop contractility is too strong lead to the pitch is unstable. but it's not effect the book binding. 

         if you have any qeustions about the binding suppiles products, such as twin wire coil. metal single binding spiral coil, plastic binding coil etc welcome to contact us. we will try our best to help you figure out the questions.