Allen keys, also known as hex keys, are hand tools used to turn screws and bolts with a hexagonal socket. They come in various sizes and are designed to fit into the socket head of the screw or bolt. Allen keys are typically L-shaped, with one end bent at a 90-degree angle to allow for easy access to screws or bolts in tight spaces.
The name “Allen key” comes from the Allen Manufacturing Company, which patented and introduced the hex socket screw and wrench in the early 1900s. Today, Allen keys are widely used in various industries, including automotive, construction, and DIY projects.
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