ADJ Mini O-Clamp

Made of plastic is much bigger than the metal ones.
Plastic is elastic enough that when tightening the two jaws close completely preventing it from tightening enough, not like in the metals that there is still a gap.
After complete tightening and closing of the jaws the clamp still rotates on a 20mm tube with some medium force.
It is ok for very light forces applied by things that are hung vertically.