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Spanners and wrenches essentially have the same purpose, which is to tighten and loosen nuts and bolts. Spanners have slimmer, fixed-sized heads designed to drive nuts and bolts of specific sizes. Wrenches have a thicker head with an adjustable lower jaw that allows them to be used on any nut or bolt they can clamp onto. 

View the spanner size chart (Metric-Imperial Equivalents).

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