I was so excited to use these clip to hold the frost cover to 1/2" PVC piping, however, they would fall off with the first breeze. So I doubled up the frost cover and they held longer, but would eventually fall off. I was disappointed.

These are really a great product to use over the plastic clamps. The plastic clamps stretch out over time and don't hold on tight the second season. I put one the the aluminum clamps over the top of the plastic one and it has so far held up this winter with the high winds.