English version

Allen key

From Longman Dictionary of Contemporary EnglishAllen keyAl‧len key /ˈælən kiː/ noun [countable] British English  a tool used to turn an Allen screw syn Allen wrench American English
Examples from the Corpus
Allen keyA sheet metal punch is drawn through by being tightened with an Allen key.
Pictures of the day
Do you know what each of these is called?
Click on the pictures to check.