Used for attaching springs for hanging chairs and other hanging accessories (such as sandbags, hanging plants, etc.). Firmly clamp the hanging chair parts to the swing chair so that it can hang, rotate and twist without getting stuck or coming loose. Made of high strength alloy with light weight and strong structure, you will like it. Sturdy structure, long industrial grade spring spiral, very suitable for your heavy duty needs. The spring hook features low noise, low stress and vibration. Essential gadgets for outdoor products.