INCLUDES - 1 pc hammock chair swing spring, 1 pc pin plug hardware, and 1 pc bearing. The spring and U-pin plugs are made of steel with a baked surface paint finish for rust-proof and corrosion-resistant performance. UPGRADE KIT - The bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness. It helps increase lubrication and reduce noise. The spring absorbs vibration during use, providing a buffering effect that extends the chair's service life and enhances comfort. WIDE APPLICATION - Compatible with most hanging chairs, egg chairs, porch swings, free-standing swings, hammocks, and hammock chairs. SAFER SUSPENSION - With a load-bearing capacity of over 500 pounds, the spring meets the daily usage needs of most households and matches the standard weight capacity of typical egg hanging chairs. EASY TO USE - Installation follows the included visual guide. The clevis pin passes through the support and connects to the spring. Setup or replacement can be completed within minutes. QUALITY GUARANTEE - Each product is carefully inspected before packaging. Satisfaction guaranteed. If you are not completely satisfied for any reason, you may request a replacement or full refund.