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5:1 Coil / Spiral

Not as common as 4:1 pitch spiral / coil, some prefer to use 5:1 pitch (5 holes per 1") spiral binding / coil or referred to 5mm they interchange. With five holes per inch, 5:1 pitch spiral / coil is tightly bound and provides a cleaner appearance. The limiting factor with 5:1 or 5mm pitch is that it only binds up to 25mm- not a good choice for larger documents as they are more difficult to bind function as a document.