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 and offers 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 capacity exceeding 500 pounds, the spring meets the daily usage requirements of most households and aligns with the standard load capacity of typical egg hanging chairs. EASY TO USE - Installation can be completed quickly by following the included instructions. The clevis pin passes through the support and connects to the spring. Simple to install or replace existing components 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.