I'm always pleased to find a tool on the road, and doubly so if it's a
primo brand such as Snap-On.

I just found a Snap-On V520B 5/8" open-end angle wrench, as their web
site calls it. It looks like a typical open end wrench but with a more
°extreme angle on the "jaw" portion - looks like about 45° rather than
the typical 30°.

Can anyone explain why such an item exists? What purpose does it serve
beyond that of the more familiar open end wrench?