Vise grips, these kind of jaws are very useful and versatile, they even have a built in wire cutter. I'm using these more and more everyday, have a few older pairs, some smaller size, and when you use 2 you can tackle a lot of jobs and odd fasteners and whatever. I know these are common knowledge to a lot of people, but I think these should be in anybody's top 5.
Also, allen wrenches will work in torx/star bits, and vice versa, just gotta find the right size.
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