a wrench having a pin for insertion into the heads of certain bolts to drive them.: Compare spanner (def. 2).
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British Dictionary definitions for pin wrench
a wrench fitted with a cylindrical pin that registers in a hole in the part to be rotated, used to improve the application of the turning moment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012