Allen Key Set
A hex key, often known as an Allen key, is a simple tool that is used to drive hexagonal socketed bolts and screws.
The tool is normally made of a single piece of hexagonal strong steel rod bent in a "L" shape with unequal arms, with blunt ends that are supposed to fit snugly into the screw's socket. The long arm normally holds the tool and twists it, providing a large torque at the short arm's tip. By reversing the tool, the long arm can reach screws in difficult-to-reach areas.
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