Heavy Duty SpringsHeavy duty springs can absorb shock and maintain longevity, reducing noise, vibration and stress, giving you a better and more comfortable swing experience. High Quality MaterialThese hammock springs are made of high quality steel, which is heat treated, galvanized surfaces, not easy to rust and durable. You can use them indoors and outdoors, on patios, porches, trees and ceilings. Load-bearing CapacityThese hammock spring has a spring thickness of 7mm/0.3in and a load-bearing capacity of 500kg/1102.3lb. They can bear general objects, are safe and stable, and you can use them with confidence. Easy to useYou just need to connect to your hammock and accessories. You can install or replace your existing one in just a few minutes and start enjoying your swing. Various ApplicationsThese hammock springs hooks are widely used in swing benches, sandbags, hammocks, wicker baskets and hanging chairs, etc.