Widely used. The capacity of the spring is 300 kilograms. Fits almost any punching bag, hanging chair, cocoon, egg chair, wicker basket. The spring helps relieve shock stress, provides a more comfortable and softer feel, and will increase the life of your hammock, in addition to your mounting surface. Quality material. The spring is made of galvanized iron. Higher corrosion resistance, not easy to rust, more durable. Good performance. Could be used with confidence. Simple assembly. With hooks at both ends, the porch swivel spring is easily connected to your hammock chair without the use of tools or complicated operations. Characteristics · Robust steel structure. Galvanized and transparent coating for a longer service life. · The spring helps relieve stress from impacts, provides a more comfortable feel and increases the life of your hammock. · Rated spring capacity over 300 kilograms, reduces noise, stress and vibration. · Suitable for garden swings, hanging basket and hanger.