I didn't read any of the posts cuz they were all LONGG! So if this was already mentioned, oops. THE MOST IMPORTANT TOOL FOR YOUR GARAGE IS A...

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Wire stripper!

Of course, lol. But seriosly, get a tracking device put on it because then when you loose it you can find it easily. I know that I spend more time looking for it than using it. AND DON'T GET THAT CHEAP ! I go to my friends houses and try to use the ones they own, WOW, never buy tools from walmart.