Used twice so far with garden spikes to hold a waterproof blanket on the grass. It was quite windy both days and that kept the blanket in place. I've read several reports that waterproof/resistant rugs are slippery because the waterproof side and soft fleece side aren't sewn together. I didn't have that problem with them at all. These clips have so far kept an excellent grip even on a windy day. I haven't used them with a tarp or in a very high wind storm so I can't speak to their effectiveness in that regard, but I did take a good look at the handle when tightening the screw on the cover and handle is pretty good. good so they work well in a downpour. as long as you have a quality plan.
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