Whether you're an auto enthusiast, home metalworker, or just want to sharpen a dull shovel, a metal file is an indispensable tool. They don't cost much, and they can last for years. Unfortunately ...

Although many nail salons tend to use emery boards, which are like a strip of fine-grained sandpaper-like material, many people prefer metal nail files like the one in Leatherman multi-tools.

The humble hand file is a such a common tool that you've probably used one at some point. But most people are using them incorrectly. A file should not be used in a "sawing" motion (pressed back ...