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 paint surface finish, providing rust-proof and corrosion-resistant properties. Upgrade kit bearing is made of steel, offering excellent wear resistance, high temperature resistance, and high hardness. It effectively enhances lubrication and reduces 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 of over 500 pounds, the spring meets the daily usage needs of most families and matches the standard weight capacity of typical egg hanging chairs. EASY TO USE - Installation follows a simple sequence. The clevis pin passes through the support and connects to the spring. Can be installed or replaced 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.