alligator wrench

from WordNet (r) 3.0 (2006)
alligator wrench
    n 1: a wrench with a v-shaped jaw and serrations on one side
         (resembles the open jaws of an alligator)
from The Collaborative International Dictionary of English v.0.48
Alligator wrench \Al"li*ga`tor wrench\ (Mech.)
   A kind of pipe wrench having a flaring jaw with teeth on one
   side.
   [Webster 1913 Suppl.]
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