A bolt is a unit of measurement used[where?] as an industry standard for a variety of materials from wood to canvas, typically materials stored in a roll. Length will vary according to the type of material measured. The length is usually either 40 or 100 yards (37 or 91 m), but varies depending on the fabric being referred to; for example, a bolt of canvas is traditionally 39 yards (36 m). The width of a bolt is usually 45 or 60 inches (110 or 150 cm),  but widths may include 35–36 inches (890–910 mm), 39 inches (990 mm), 41 inches (1,000 mm), 44–45 inches (1,100–1,100 mm), 50 inches (1,300 mm), 52–54 inches (1,300–1,400 mm), 58–60 inches (1,500–1,500 mm) and 66 inches (1,700 mm), 72 inches (1,800 mm), 96 inches (2,400 mm), and 108 inches (2,700 mm).
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