Cnc clamps and spacers for 18mm and 12mm hight
I have only tried the 18mm ones they worked really well for facing a few pieces of wallnut.
Not sure about the amount of movement offered but i managed to use them with some spacers as well for some odd pieces.
They have the version and the thickness embossed on the right side up faces.
I would suggest using Washers with the screws to reduce the wear and tear i believe they fit a maximum of 25 mm washers. I just use 24mm ones like these:
Washers
been inspired by this:
https://www.printables.com/model/399012-cnc-cam-clamp
thank you Elphwrkz
The author marked this model as their own original creation.