box spanner

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box spanner

n
(Tools) a spanner consisting of a steel cylinder with a hexagonal end that fits over a nut: used esp to turn nuts in positions that are recessed or difficult of access
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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There are also metric and imperial box spanners, plus hex pattern screwdriver bits and flexible shaft.