This design allows my cheapy Ebike controller display with small non adjustable 22mm handlebar attachment to fit my road bike handlebars which are kind of a weird oval profile and much bigger than the cheap moutainbike handlebars they had intended, the diameter of the clamp is 33mm but it needs to be slightly smaller than your bars in order for the clamp to tighten.
The author marked this model as their own original creation.