An Allen wrench, also known as a hex key, is a small tool used to drive screws and bolts with a hexagonal socket. It has a simple L-shape, making it easy to grip and turn. Allen wrenches are commonly used for assembling furniture, bicycles, and machines, as many screws and bolts are designed with a hexagonal socket. They come in various sizes to fit different fasteners, and their compact design allows for easy storage and use in tight spaces.

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