This heavy duty spring made of iron is suitable for hanging hammock chairs and other hanging accessories like punching bags, hanging plants, etc. It securely clip onto your swinging chair, let you and without tangling or have to untwist. Low noise, stress and vibration. Feature - Color: Silver. - Material: Iron. - Size: About 10.6x3.9x3.9cm/ 4.17x1.53x1.53 inch. - Bearing: 200kg. - Spring for mounting hammock chairs and other hanging accessories like punching bags, hanging plants, etc. - Securely clip onto your swinging chair, let you and without tangling or have to untwist. - High strength steel with surface electric galvanizing. Light weight with sturdy structure, you will like it. - Sturdy steel construction, Industrial quality long spring coil, perfect for all your heavy bag needs. - Low noise, stress and vibration. An essential gadget for outdoor supply. Package list: 4 x hammock spring