Way long ago this basic design started appearing, and I saved up my pennies and got a wrench of a similar sort. Still have it 60-odd years later, and it's still occasionally useful. That one, like the one shown here, had a squared-off jaw making it at least moderately good for a variety of nuts. If you do plumbing work a lot, you may have run across a similar design with somewhat rounder jaws, in the articulated basin wrench, which is designed to undo the otherwise inaccessible nuts on faucets up under a sink. Those are surprisingly cheap for a tool for which there is really no substitute.
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