I’m going to call this the problem solver. Once or twice a year I need a thin jaw wrench. Usually to counterhold a thin nut in a tight location. Last weekend was one of those instances while working on the brakes on my dad’s car. 10 trips back and forth to the toolbox to find something. Needle nose pliers wouldn’t work, none of my open end or adjustable wrenches would work. I have one bicycle cone wrench for doing the brakes on my car, but it was too small. There was one small cheap craftsman adjustable that was a tiny bit too fat, but I made it work. Enough already!
Channellock makes a version of these thin jaw adjustables, but reviews said the jaws aren’t parallel. And since I can’t inspect locally before buying, I went with these Klein’s (made in Spain). The jaws are perfect. Machining isn’t anything to brag about, but they will do what I need them to do.