I used to use all sorts of tarp clips, then I found these

EZ Grabbit

and I threw out/gave away all the clips I owned and bought up a bunch of these. Far, far superior to any sort of clip. Check out the video demos on the website. You will see why these are a much better choice. I'd rather have two of these (even the mini size) than a dozen clips.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)