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 finish for rust resistance and corrosion resistance. UPGRADE KIT: Bearing is made of steel and offers excellent wear resistance, high temperature resistance, and high hardness. It helps improve lubrication and reduce noise. The spring absorbs vibration during use, providing a cushioning effect that increases the chair's service life and enhances 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 of over 500 pounds, the spring meets the daily usage needs of most families and matches the weight capacity of standard egg hanging chairs. EASY TO USE: Refer to the included image for installation sequence. The clevis pin passes through the support and connects to the spring. Installation or replacement can be completed 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.