Allen key™
noun/ˈælən kiː/
/ˈælən kiː/
(British English) (North American English Allen wrench™)
- a small tool used for turning an Allen screw™
enlarge image艾伦螺钉扳手；六角螺钉小扳手 Word Origin1960s: from the name of the manufacturer, the Allen Manufacturing Company, of Hartford, Connecticut.