I have a set of three to cover quite a size range. No idea where I bought them, might have been in Germany as I lived there for 15 years a couple of decades ago. Actually, can't ever remember using them as my first choice is always a proper spanner or socket!

Looks like an "Ideal Home Show" special. Bought because it looked good at the time, but then just languishes in a drawer somewhere, because a regular spanner is more convenient.

The slang in German for that wrench type, at least in Augsburg area, is "mutternwracke". Translated to English, it is "nut-ruiner" (for good reason).

I do have a couple of those somewhere, but never been that impressed with them.

Cromna ones however, whilst no longer made, really do work well; they grip rusty and rounded fasteners, as well as round bar if used carefully. Available in sizes 1-4.

I've not reproduced the photos here to save clogging up the forum storage, but there's a few either side of that photo in my flickr album.
There's also a few extra ones in my Facebook album if you have access to that particular social media.

Bill

Have number of this sort of spanner, almost all unused, but seemed "A good idea at the time"

If the worst comes to the worst, a "footprint", Stilson or Mole wrench usually do the trick,, but at the expense of the the appearance of the piece being rotated.

Howard

I have one as in the photo at the top. On one side it says "#A210 Taiwan 3/8-13/16"" (yes one set of double apostrophes from the spanner, and one from me).

On the other side it says " (Strange symbol I can't reproduce) 15-22 MASTER9-14 N".

The heads are chromium plated, and coming off, whilst the main handle looks as if it might be chrome-vanadium.

Peter G. Shaw

No Tim, I hadn't – I just wanted to be clear that it wasn't a typing error.

Peter G. Shaw