INCLUDES - 1 pc hammock spring, 1 pc pin plug, and 1 pc bearing. The spring and U-pin plugs are made of steel, surface painted and baked through the baking process, rust-proof and corrosion-resistant. Upgrade Kit Compatible with Bearings - The BEARING is made of steel with excellent wear resistance, high temperature resistance, and high hardness. It can effectively increase lubrication and reduce noise. The spring can absorb vibrations when shaking, play a buffering role, increase the chair's lifespan, and make it more comfortable when shaking. WIDE RANGE OF USE - Compatible with use with almost all hanging chairs, egg chairs, porch swings, freestanding swings, hammocks, and hammock chairs. SAFER SPRING - With a load capacity of more than 500 pounds, the spring can meet the daily use of most families, which is consistent with the load capacity Compatible with common egg hanging chairs. EASY TO USE - You can see the picture Compatible with the installation sequence, the clevis pin goes through the support and connects to the spring. You can install it or replace existing ones in minutes. QUALITY GUARANTEE - Each product is carefully checked Compatible with Compatible with packaging. Satisfaction guarantee. If for any reason you are not completely satisfied, you can request a replacement or full refund, no questions asked.