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There is a variant for half-letter size pages (8 + 1 ⁄ 2 by 5 + 1 ⁄ 2 inches or 220 mm × 140 mm), whose three rings are 2 + 3 ⁄ 4 inches (70 mm) apart. "Ledger" size binders hold 11-by-17-inch (28 by 43 cm) paper, and may use standard 3-ring spacing or multiple additional rings.
Then the user chooses a spine size that will match the document. Standard sizes are 4.8 mm ( 3 ⁄ 16 in) (for 16 sheets of 20# paper) up to 51 mm (2 in) (for 425 sheets). Spine lengths are generally 280 mm (11 in) to match the length of letter-size paper.
The 3:1 pitch hole pattern is most commonly used for binding small documents with double loop wire. Spines are available in sizes between 4.8 mm (3 ⁄ 16 in) and 14 mm (9 ⁄ 16 in) in diameter. The hole pattern can use either square or round holes.
The holes are positioned symmetrically, with the centers 4 + 1 ⁄ 4 inches (108 mm) apart. It requires paper formats that are at least 9 + 1 ⁄ 2 inches (241 mm) high. There is a variant for half-letter size pages (8 + 1 ⁄ 2 by 5 + 1 ⁄ 2 inches or 220 mm × 140 mm), whose three holes are 2 + 3 ⁄ 4 inches (70 mm) apart.
In North America, 3-hole binders for letter-size papers typically have a width of 1/2 inch, 1 inch, 1.5 inches, 2 inches, 3 inches or 4 inches; in ISO system, binders typically have a width of less than 3 cm. “Discbound” loose leaf systems, which uses separate “discs” to hold covers and pages. Staples and Office Depot sell discbound ...
This type of binding uses either a 3:1 pitch hole pattern with three holes per inch or a 2:1 pitch hole pattern with two holes per inch. The three to one hole pattern is used for smaller books that are up to 9/16" in diameter while the 2:1 pattern is normally used for thicker books as the holes are slightly bigger to accommodate slightly ...