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1. A wrench adapted for fastening and unfastening first and second bolts of different sizes, said wrench comprising a head formed with a polygonal first engaging hole that is defined by a plurality of engaging surfaces and that is adapted for engaging a head of the first bolt, each of said engaging surfaces having a pair of spaced-apart plane surface portions and an intermediate surface portion that interconnects said plane surface portions and that defines a groove extending in a direction of a central axis of said first engaging hole, said grooves of said engaging surfaces collaboratively defining a polygonal second engaging hole that is adapted for engaging a head of the second bolt with each corner of the head of the second bolt being received in said groove of a respective one of said engaging surfaces, said intermediate surface portion of each of said engaging surfaces cooperating with said plane surface portions of a corresponding one of said engaging surfaces to form two angular intersections that are adapted to abut respectively against side surfaces of the head of the second bolt that define a corresponding corner of the head of the second bolt so as to prevent the corresponding corner of the head of the second bolt from contacting said intermediate surface portion of a corresponding one of said engaging surfaces.
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