"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Hex wrenches, also known as Allen keys, are the tools you use to screw and unscrew fasteners that have a ...

Wrenches are among the most ubiquitous and invaluable hand tools. They fit firmly around nuts and bolts, and their long handles generate a ton of leverage when you need to loosen or tighten fasteners.

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 ...

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