I normally don't post over here because most of the stuff I buy is just what everyone else purchases (or of lesser quality, so I'm usually a bit on the humbler side of the purchase). But this time, it was too valuable to pass up ($11).
I was watching a woodworking video (talking about using 1-2-3 blocks for wood working setups), and the narrator mentioned 1-2-3 block set up hardware. Heretofore, I've used the threads in the 1-2-3 blocks, or bolts all the way through the blocks, to do my set ups. These little kits are pretty nifty.
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The barrel nuts slide right in (some issue with size interference on some 1-2-3 blocks), and have a slot on the side to align the nuts. Then you just thread things together.
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Makes setups without protruding bolts or nuts very easy.
Granted, this would be an easy thing to make for yourself, but I had to go make a purchase of them just because the brilliance behind the kit.