That describes a Cresant/adjustable spanner perfectly and yet we all have at least one of these in our toolkits.
These open ender ratchet spanners do look interesting but Not $200+ interesting unfortunately.
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I wouldn't use them, I loathe open ender's but they are a necessary evil.
One of the German tool company's make an open ender that has a hardened insert with teeth that mimics a ratchet.
They look interesting but are bloody expensive.
Having said that, Gearwrench make very nice tools. I've only recently bought a 3/8 drive 6 point socket set, a bunch of wobble drives and extensions, plus adapters and unis to replace my old 1/2" drive Sidchrome/Snap On/Teng gear that went walkabout recently.
There are a few variations on a theme. There will be a time when one would be really, really handy but most of the time they will be gathering dust.
Kincrome 7 Piece Metric Double Ended Ratcheting Spanner Set
I have one at home I got from a trash & treasure market, can't remember the brand. The concept must have been around for a while.
Colin
Here's the one I got from a trash & treasure market. Made by (or patented by) Alden in the US. Patent filed in 1971 and granted in 1973 .......
https://www.aulro.com/afvb/images/im...018/04/944.jpgDSCN4781 by Colin Radley, on Flickr
https://www.aulro.com/afvb/images/im...018/04/945.jpgDSCN4783 by Colin Radley, on Flickr
https://patents.google.com/patent/US3762244
Colin
I had a set back when I worked on BMC vehicles , thought they would be good for removing Nylock nuts Mini Universal joints . never liked them at all, found it was easier & quicker just using normal open ended spanner. I have no idea were they are now probably ended up selling them at a garage sale.[bighmmm]