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 bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness.br> It helps enhance lubrication and reduce noise. The spring absorbs vibration during use, providing a buffering effect that increases the chair's service life and improves 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 exceeding 500 pounds, the spring meets the daily usage needs of most households and aligns with the standard weight capacity of typical egg hanging chairs. EASY TO USE - Installation follows a simple sequence as illustrated. 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.