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The diameter of the holes varies between manufacturers, with typical values being 1 ⁄ 4 to 5 ⁄ 16 inch (6 to 8 mm). The 5 ⁄ 16 value is most commonly used, as it allows for looser tolerances in both ring binder and paper punching. The distance to the paper edge also varies, with 1 ⁄ 2 inch (13 mm) hole
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.
A heavy duty office staple might be designated as F1667 STFCC-04: ST indicates staple, FC indicates flat top crown, C indicates cohered (joined into a strip), and 04 is the dash number for a staple with a length of 0.250 inch (6 mm), a leg thickness of 0.020 inch (500 μm), a leg width of 0.030 inch (800 μm), and a crown width of 0.500 inch ...
"Ledger" size binders hold 11-by-17-inch (28 by 43 cm) paper, and may use standard 3-ring spacing or multiple additional rings. The distance from the punched holes to the nearest edge of the paper is less critical, since small differences do not affect the compatibility of paper and binder.
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Light-duty tools are operated by squeezing the handle with the fingers, while heavy-duty versions can be powered by compressed air or a solenoid, to prevent repetitive strain injury. In order to increase resistance to ultraviolet light in outdoor applications, nylon containing a minimum of 2% carbon black is used to protect the polymer chains ...