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 improve lubrication, reduce noise, and extend service life. The spring absorbs vibration during use, providing a buffering effect for increased comfort and durability. 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 supports the daily use of most households and matches the typical weight capacity of standard egg hanging chairs. EASY TO USE - Installation is simple; refer to the included illustration 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.