pin wrench

pin wrench

noun
a wrench having a pin for insertion into the heads of certain bolts to drive them. Compare spanner ( def 2 ).
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World English Dictionary
pin wrench
 
n
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 10th Edition
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