Hex Keys, also known as Allen wrenches, are tools designed to drive screws and bolts with a hexagonal socket. Common types include L-shaped and folding Hex Keys, which provide versatility for different tasks. They are widely used for assembling furniture, adjusting bicycles, and performing maintenance on machinery. These tools are essential for both professional tradespeople and DIY enthusiasts, as they enable accurate tightening and loosening of fasteners in various projects.