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This is a gadget that is similar to Nite Ize "Figure 9". Use it for tarp tenting, strap things onto you backpack or whatever. I think it is better than the "figure 9". Brakeload is about 25 kg, so it is much stroner that it looks.
It is designed for lines from 1-3 mm but can be used wih lines down to 0,7mm (tested).