- The swing springs are SUPER HEAVY DUTY and will not stretch out. Zinc plating on the hardened steel enhances weather resistance and extends the lifetime of the porch swing spring. - Rated for over 800 lbs capacity, the porch swing spring is easy to connect to your hammock chair without tools or complicated operation. - The spring helps relieve impact stress, provides a more comfortable, softer feel, and will increase the lifespan of your hammock and mounting surface. - Fits Almost All Punch Bag, Hanging Chairs, Cocoon, hanging egg chair, wicker basket and other object from overhead mount. Use scenarios - Outdoor porch or deck Install the spring on an overhead mount to use with a hammock chair or porch swing. Expect smoother motion, reduced jolt from movement, and improved comfort while protecting the mounting hardware and extending the life of the hammock. - Indoor hanging chairs and cocoons Use with hanging egg chairs, cocoon, or similar overhead mounts inside living spaces. The spring provides a controlled, softer swing experience and helps preserve both the chair and its mounting point. - Home gym or garage Attach to a punching bag or other overhead suspended object. The spring absorbs impact, reducing stress on the mount and equipment, and helping maintain performance and durability over time.