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https://niteize.com/figure-9r-carabiner-rope-tightener Figure 9® Carabiner Rope Tightener The innovative patented Figure 9 is a carabiner rope tightener that tightens, tensions, and secures cords and ropes without using knots. The result is a hassle-free alternative to tying and untying difficult knots and having ropes quickly lose tension. niteize.com https://niteize.com/figure-9r-rope-tightene..