What is the use of hex key?

A hex key, also known as an Allen wrench, is a six-sided tool used to drive bolts and screws with hexagonal sockets. Its design allows for a secure grip and efficient torque application, making it ideal for assembly and disassembly tasks, particularly in furniture, bicycles, and machinery. Hex keys are available in various sizes and can be L-shaped or folding for convenience. They are essential in both DIY projects and professional settings for tasks requiring precise fastening.