Includes - 1 hanging chair swing spring, 1 locking hardware, and 1 bearing. The spring and U-shaped lock are made of steel, and the surface is treated with a baking paint process, making it rust-proof and corrosion-resistant. Upgraded Kit Bearing - The bearing is made of steel, offering excellent wear resistance, high-temperature resistance, and high hardness. It effectively enhances lubrication and reduces noise. The spring absorbs vibrations during swinging, acting as a buffer to extend the chair's lifespan and provide a more comfortable swinging experience. Wide Application - Suitable for almost all hammocks, egg chairs, porch swings, freestanding swings, hanging chairs, and hanging mats. Safer Suspension - The spring boasts a load capacity exceeding 500 pounds, meeting the daily needs of most families and compatible with the load capacity of standard egg-shaped hammocks. Easy to Use - Refer to the image for installation order. The U-shaped pin passes through the bracket and connects to the spring. You can install or replace it in minutes.