Allen wrench Directory References Discover Inventors and Inventions of the Industrial Revolution Timeline of the 2000s Weapons of World War I Timeline of the 1980s 11 Egyptian Gods and Goddesses 26 Decade-Defining Events in U.S. History 9 Things You Might Not Know About Adolf Hitler Contents Ask the Chatbot a Question Allen wrench tool Ask the Chatbot a Question Learn about this topic in these articles:wrenches In wrench…usually referred to as an Allen wrench; it consists of a hexagonal bar of tool steel shaped into the form of an L, either end of which fits into the recess.Read More Britannica ChatbotChatbot answers are created from Britannica articles using AI. This is a beta feature. AI answers may contain errors. Please verify important information using Britannica articles. About Britannica AI.