The hanging chair spring has a length of approximately 10 cm (4") and a steel thickness of 7 mm (0.27"). It has a spring capacity exceeding 1000 lbs. These super heavy-duty swing springs absorb shock, preserving longevity and reducing noise, vibration, and stress, without stretching out. The hammock spring is zinc-plated on hardened steel with an electric galvanizing surface. This sturdy, anti-corrosion design enhances weather resistance and extends the lifespan of the porch swing spring. The heavy-duty spring is positioned between the overhead support and the swing chain, providing a more comfortable and softer feel for porch swings, free-standing swings, hammocks, and hammock chairs. The spring hook fits almost all porch swings, bags, hanging chairs, cocoons, hanging egg chairs, wicker baskets, hanging hammock chairs, heavy bags, boxing equipment, yard sling swings, and other sporting equipment. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store