Helpful tools that get overlooked/forgotten

[simplechamp]

It's safe to say most of us have hex drivers, needle-nosed pliers, and other common hand tools. But what other helpful tools do you have that you think others often forget or overlook? The kind of things that aren't absolutely necessary, but can make a task much easier.

I have some extra room in my RC toolbox, looking to add some things I may have missed.