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Oval holes vs. round holes in coil binding

The oval hole pattern uses a 4:1 pitch (0.248″) versus the standard round hole 4:1 pitch (0.250″)

Most coil binding machines are made with round hole punches. The oval hole pattern pitch is designed to give you 44 evenly-centered holes on an 11″ sheet, and make it easier for pages to turn and the additional height of the oval makes it easier to insert the coils.  The hole pattern is compatible with standard 4:1 pitch coils and can increase productivity by as much as 40%.