box wrench

Noun
  1. A wrench with a closed loop (a socket) that fits over a nut or bolt head (synset 102889675)
    is a type of: spanner, wrench - a hand tool that is used to hold or twist a nut or bolt
    has: socket - receptacle where something (a pipe or probe or end of a bone) is inserted
    same as: box end wrench

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