gearwrench quadbox wrenches.

[kiatech]

These things are pretty badass, never knew such thing existed. A guy at work had one and I have to admit its pretty handy. I do electrical work now so I deal with lots of all thread and easy to get at bolts. I wouldn't use it a vehicle for anything other than changing oil.

 

[exophyusical]

I used to have a couple in my service truck, awesome tools. Between two of them and a crescent for backup there were very few fasteners you couldn't get.

Now I deal with a lot of hydraulics and they don't work so well.

 

[johnny5c]

I have a couple in my ATV/snowmobile toolkit and they do come in really handy. The Quadboxes and Gearboxes are IMO some of the best designed wrenches out there.