[1] Used to install springs for hanging chairs and other hanging accessories (such as sandbags, hanging plants, etc.). [2] Firmly clamp the hanging chair parts to the swing chair so that it rotates and twists without getting stuck or coming loose. [3] Sturdy structure, long industrial grade spring spiral, very suitable for your demanding needs. < p>[4] The hook The spring features low noise, low stress and vibration. Essential gadgets for outdoor products.