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 - The bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness. It helps increase lubrication, reduce noise, and absorb vibration during use, providing a buffering effect that enhances comfort and extends the service life of the chair. 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 requirements of most households and aligns with the standard weight capacity of typical egg hanging chairs. EASY TO USE - Installation is simple; refer to the included image for assembly sequence. The clevis pin passes through the support and connects to the spring. Can be installed or replaced in 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 with no questions asked.