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A hex key (also, Allen key and Allen wrench) is a simple driver for bolts or screws that have heads with internal hexagonal recesses (sockets).Hex keys are formed from a single piece of hard steel hexagonal rod having blunt ends that fit snugly into similarly-shaped screw sockets. The rods are bent to 90º, forming two arms of unequal length resembling an "L". The tool is usually held and twisted by its long arm, creating a relatively large torque at the tip of the short arm; it can also be held by its short arm to access screws in difficult-to-reach locations and to turn screws faster at the expense of torque.