INCLUDES: 1 Hammock Chair Swing Spring, 1 Pin Plug Hardware, and 1 Bearing. The spring and U-pin plugs are made of steel with a surface paint baking process, making them rustproof and corrosion-resistant. UPGRADE KIT BEARING: The BEARING is made of steel, offering excellent wear resistance, high-temperature resistance, and high hardness. It effectively increases lubrication and reduces noise. The spring absorbs vibrations during shaking, providing a buffering effect, increasing the chair's lifespan, and making it more comfortable to swing in. WIDE APPLICATION: For use with almost all hanging chairs, egg chairs, porch swings, freestanding swings, hammocks, and hammock chairs. SAFER SUSPENSION: With a load capacity of over 500 pounds, the spring meets the daily needs of most families, matching the load capacity of standard egg hanging chairs. EASY TO USE: Refer to the picture for the installation sequence; the clevis pin goes through the support and connects to the spring. Install or replace existing hardware in minutes. Quality Guarantee: Each product has been carefully inspected before packaging. Satisfaction guaranteed. If for any reason you are not completely satisfied, you can request a replacement or a full refund, no questions asked.