Uploaded February 2024 | Updated September 2026, 2 weeks ago

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Allen keys, also known as hex wrenches or hex keys, are designed to tighten or loosen hexagonal-shaped bolts and screws. These are basic but highly versatile hand tools that can be used for various jobs, from flat-pack furniture assembly to professional applications.
Originally named Allen Manufacturing Company, the business produced hexagonal set screws and wrenches to fasten them. The terms "Allen wrench" (American English) and "Allen key" (British English) are derived from the Allen brand name and refer to the generic product category "hex keys".
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