Hex keys, also known as Allen wrenches, are small tools used to drive screws and bolts with hexagonal sockets. They come in various sizes and shapes, typically made from steel or other durable materials. Hex keys are commonly found in furniture assembly, bicycle repairs, and machinery maintenance, making them essential for DIY projects. These tools are often sold in sets, allowing users to select the appropriate size for their needs. Hex keys can be L-shaped or foldable, providing versatility in tight spaces. Their simple design makes them easy to use, even for those with limited mechanical experience.