Allen key Definition in Cambridge British English Dictionary
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Definition of "Allen key" - British English Dictionary

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Allen keynoun [C]

uk   us   /ˈæl.ənˌkiː/ (also Allen wrench) trademark
an L-shaped metal tool with six sides that is used to turn a screw that has a six-sided hole in the top
(Definition of Allen key from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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