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Combination square
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=== Rule === Combination square rules are made of steel and can be purchased with gradations in [[Metric system|metric]], [[Imperial units|imperial]], or both metric and imperial. Both faces of the rule have markings, providing four different sets of markings. This allows different sides to have different graduations (eg. 1mm or 0.5mm markings) or units (ie. metric and imperial). The rule typically comes in lengths between 150mm and 600mm or between 4 inches and 24 inches.<ref name=":4" /><ref name=":3" />
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