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, absorb vibration during use, provide a buffering effect, extend the chair's service life, and enhance 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 needs of most households and aligns with the standard load capacity of typical egg hanging chairs. EASY TO USE - Installation follows the included image guide. 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, a replacement or full refund is available.