The tool section of this site seems to get a lot of traffic, and every time I work with people, they have at least one tool that they swear by. Tools really do make the job, so I thought I'd start a thread for people who want to share what tool is a must-have in their tool bag that a lot of people may not keep or even know about. I guess I'll start;

This isn't exactly a tool that no one's heard of, but it's one that a lot of people may not have. It really saves the day when servicing RTUs in particular, especially heat exchangers and blowers.http://www.google.com/imgres?um=1&hl...9,r:6,s:0,i:83
I'm not sure if the brand I have is Milwaukee or not, but I do know that the handle comes off the one I use. The handle seems kind of pointless to me. Milwaukee makes another model of this that's more heavy duty, but this is good enough as long as you're just taking screws in and out or doing light drilling.

Another attachment I really like and comes in handy, but don't own yet:
http://www.google.com/imgres?num=10&...r:22,s:0,i:115 This isn't the exact one I've seen used, but you get the point. What are some go to tools for you??