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 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 improve lubrication and reduce noise. SPRING FUNCTION - The spring absorbs vibration during use, providing a buffering effect that enhances comfort and extends the lifespan 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 capacity exceeding 500 pounds, the spring meets the typical weight requirements for standard egg-shaped hanging chairs, ensuring safe daily use. EASY TO INSTALL - Refer to the included illustration for installation sequence. The clevis pin passes through the support and connects to the spring. Installation or replacement can be completed quickly and easily. QUALITY GUARANTEE - Each product is thoroughly inspected before packaging. If you are not completely satisfied, a replacement or full refund is available.