Characteristics - Made of galvanized iron. Higher corrosion resistance is hard to rust and more durable. Good performance. Can be used with confidence. Function - Springs help reduce vibration pressure, provide more comfortable, softer feelings and extend the life of the hammock in addition to the mounting surface. The set is simple - both ends with hooks, the porch rotary spring can be easily connected to your hammock without the use of tools or complex operations. Replacement spring - Suitable for garden swing, hanging baskets and hangers. Specifications - Packaging: 7mm Tension Spring * 3. Materials: galvanized iron. Weight: 198 grams per unit. Length: 108 mm. Spring Hamock, Hard Spring Spring Spring Suspension Hammock for Hanging Chairs, Outdoor Accessories, Garden Swing Hook (8 mm) Specification: Material: galvanized iron. weight: 198 grams per unit. Size: 108 mm long. color: silver. Quantity: 3 * 7 mm Characteristics: light weight. It is very convenient to wear. - galvanized, increasing the ability to withstand bad weather. NOTE: 1. For manual measurement, please allow 1-3cm error. Make sure you do not mind, then bid. 2. Due to differences between different displays, the picture may not reflect the actual color of the project. Please take the actual standard. Thank you 3. Remember to check the condition of the hammock before use.