"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 ...

This article may contain affiliate links that Yahoo and/or the publisher may receive a commission from if you buy a product or service through those links. Tradespeople and DIYers who need to do some ...

If you’ve assembled IKEA furniture, you’ve used an Allen wrench. These slim, L-shaped contraptions are often the only tool included in the packaging, even when you’ll need others to finish the job.