box end wrench


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Noun1.box end wrench - a wrench with a closed loop (a socket) that fits over a nut or bolt headbox end wrench - a wrench with a closed loop (a socket) that fits over a nut or bolt head
socket - receptacle where something (a pipe or probe or end of a bone) is inserted
spanner, wrench - a hand tool that is used to hold or twist a nut or bolt