Have a look: The Allen fits snugly into the recess of the screw or bolt being used, which is also six-sided. The tool is, therefore, commonly known as a hex wrench or hex key. So how did Allen ...

Bicycle-specific tool giant, Park Tool sends us their Sliding Hex Wrenches with some great features for review, and they are ...

Also known as hex keys, Allen wrenches are vital to any handyman's toolkit. They are formed from hexagonal-shaped steel rods ...