The innovative, patented Figure 9 tightens, tensions, and secures ropes without knots - a hassle-free alternative to untying difficult knots and using ropes that quickly lose tension. It has a carabiner clip that attaches to any fixed anchor point.The Nite Ize Figure 9 Carabiner tightens, tensions, and secures ropes without knots. Whether tethering a canoe to your vehicle, anchoring boxes to a dolly, or bundling wood, this carabiner secures large loads quickly and keeps tension where you need it. Loop your rope through its strategically designed prongs, pull it tight, and it stays that way.A smart alternative to complicated cam-locking tensioning devices and bungee cords, the Figure 9 Carabiner also controls the release of high tension, avoiding sudden and dangerous unloading.