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The most common type in Canada and the United States is a three-ring system for letter size pages (8 + 1 ⁄ 2 by 11 inches or 220 mm × 280 mm), whose size is similar to ISO 216-based A4 size. A standard 8 + 1 ⁄ 2 by 11 inches (220 mm × 280 mm) sheet of paper has three holes with spacing of 4 + 1 ⁄ 4 inches (110 mm).
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.
Like the similar-sized ISO A5, it is used for everything from personal letter writing to official aeronautical maps. Organizers, notepads, and diaries also often use this size of paper; thus 3-ring binders are also available in this size. Booklets of this size are created using word processing tools with landscape printing in two columns on ...
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For US legal paper size (8 + 1 ⁄ 2 by 14 inches, 220 by 360 mm), a 4-hole system exists. It is still in use today, but is not as common as the 3-hole standard. The four holes are positioned symmetrically with centers 3 + 1 ⁄ 2 inches (89 mm) apart. The four binding positions provide more support for the longer 14-inch side of legal paper.
Ring binders or lever arch files designed to hold foolscap folios are often used to hold A4 paper (210 × 297 mm, 8 + 1 ⁄ 4 × 11 + 3 ⁄ 4 in). The slightly larger size of such a binder offers greater protection to the edges of the pages it contains.