Hex wrenches, also known as Allen keys, are the tools you use to screw and unscrew fasteners that have a hexagonal recess (as opposed to a Phillips or flathead recess). Hex screws are commonly used on ...

Halfords set is the only one here to include full-size hex keys with ball ends to allow you to work at an angle, rather than bits. You get holders for bits and keys, but no case. The essentials are ...

From type to tolerances, our guide to the often overlooked tool Excluding your mind, hands and perhaps bottle opener, nothing in the bicycle workshop is likely to get more use than Allen keys (AKA hex ...