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== Hole patterns ==
The most common hole pattern used with coil binding is a 4:1 [[pitch]] hole pattern (6 mm outside the US), which has four holes per inch along the binding edge of the sheets of [[paper]]. The holes for this style are usually either round or oval shaped and depending on the size and spacing of the hole pattern, there will be 43 or 44 holes on an eleven-inch binding edge. Supplies for binding documents with 4:1 pitch spiral coil are available in sizes ranging from 6 mm up to 50 mm in diameter. This allows for binding documents that are up to two inches thick.
A .2475-inch pitch spiral is similar to the 4:1 pitch plastic spiral; the difference is .0005 inch per loop. This pitch was designed to slightly modify the 4:1 pitch punch pattern to perfectly center 44 holes on an 11-inch binding edge and still use the 4:1 pitch coil. This makes it easier to automate the coil insertion process. Some manufacturers make the coil specifically in the .2475-inch pitch to make it even easier. Coil is available in 6 mm to 30 mm in .2475-inch pitch.
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