Product review (4 stars): Just fits
I had to tighten the screws to the max to get the straps to fit tightly on the vent diverter. But they do work...just. The metal is certainly better than the plastic ties which came with the diverter. My original diverter snapped the handle, and one of the plastic ties broke.
Only downside: No easy hook to hang from, on either the diverter or these clamps. I had to slip a cord under the screw before it was completely tight. My diverter is suspended in the air.