Material: Made of high-quality steel. Heavy-duty steel construction. Good performance. Higher corrosion resistance, not easy to rust, more durable. Good performance. Can be used with confidence. Size: Wire diameter: 7mm/0.28\", Length: 106mm/4.17\". Sturdy, solid, can hold up to 200 kg (440 lbs) for 1 spring and 400 kg (880 lb) for 1 pair of springs. Function: The spring helps relieve the stress of impacts, provides a more comfortable and softer feel, and increases the lifespan of your hammock, in addition to your mounting surface. Easy assembly: With hooks at both ends, the swing spring porch swing easily connects to your hammock chair without using any tools or complicated operations. Versatile: Suitable for almost all porch garden decks and garden swings, hammock, hanging chair, carry bag, cocoon, rattan chair, basket, etc. Feature: Brand new and high quality Made of heavy-duty steel, galvanized for better weather resistance. Helps reduce impact load and provides comfort; increases the lifespan of your hammock and mounting surface. Suitable for almost all sandbags, hanging chairs, hammock chairs, cocoons, egg chairs. Specifications: Load capacity: 200 kg / 440 lb (for 1 spring), 400 kg / 880 lb (for 1 pair of springs) Material: Steel Size: Length 106 mm Colors: Silver Quantity: 4 pcs Package included: 4 x Spring Hook Notes: 1. Please allow 1-3 cm error due to manual measurement. Please make sure you do not mind before bidding. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please take the real one as standard. Thank you! 3. Remember to check the hammock extension spring before use.