Hammock Hanging Kit: The hammock attachment kit contains 1 * hammock spring, 1 * 360 swivel hook, 2 * carabiners. All parts are made of high quality 304 stainless steel, which is of high hardness, corrosion resistance, no rust, easy to clean and environmental protection. It is an ideal choice for your home, patio, balcony, garden, deck and backyard. ---- It is recommended to keep them in a dry and windy place for a long time. .Special Steel Spring: Heavy duty spring is about 15cm in length, maximum load: 250 kg. The steel spring introduces a unique uniform suspension system, which can increase the elasticity of your hammock. The hanging chair's swivel spring helps relieve stress from impacts and allows for smooth movement, so you can comfortably enjoy your swing, hanging chair, hammock, or sandbag safely. .Rotate 360: The swivel ring is 360 degree freely rotatable, which is designed for applications where a quick swivel assembly with hook or quick link is expected. The double-ended swivel eye hook allows for 360 rotation without any tangles or twists, and the carabiner will clip securely to your hammock or swing chair. .Easy to use: Open the carabiner to secure it with a hammock spring, then attach your hanging chair with a swivel hook. The spring hanger can be hung easily in 10 seconds without using any tools or complicated operation. With hooks on both ends, the spring is easy to connect your hanging hammock/swing chair with a swivel hook. .Indoor and outdoor use: Spring hanging kit is perfect for all indoor or outdoor swing products, including swing, hammock chair, indoor hanging chair, swing/garden chairs, egg chair, hammock yoga, the hammock swing, the punch bag or hang any other heavy object from a hanging rack. This hammock coil set is suitable for socializing or having a happy time. .