Bought because I was tired of packing things like my sailboat with a square tarpaulin. This year I just covered the boat with a tarp and grabbed where it needed tensioning, inserted a bushing and added a bungee. Very easy to use (hat shaped side on the handle, ring on the flat side with the rounded edge down). Magnets hold them in place and you simply slide them over the tarpaulin and press them together. I used a standard blue plastic tarp and the best I did was 4 layers that were still easy to pierce with the tool. no pre-drilling necessary. When I needed to connect 2 tarps to go around the mast I simply put grommets every 6-8 inches on each tarp and tied them together. I wish I had bought this many years ago.
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