Most people have encountered an Allen wrench (or Allen key). It’s the L- or S-shaped tool with a six-sided head that can easily be gripped between your thumb and forefinger to assemble ...

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

You can grab a monkey wrench. Want to put together an IKEA bookshelf? An Allen wrench works. If you have a plumbing issue, however, you’re likely to turn to the wrench that can sink its literal ...