Hillman 25 in. x 120 lb. Extension Spring w/Safety Cables, Green is designed to provide reliable counterbalance for your garage door, ensuring smooth and safe operation. These extension springs are mounted along the sides of the garage door or above the horizontal tracks, stretching and contracting as the door moves to effectively offset the door’s weight. I for residential garage doors, which typically require two extension springs—one on each side—this product is also suitable for commercial doors that may need multiple springs on each side. The package includes detailed instructions, mounting hardware, and important safety warnings to help you install the springs correctly and avoid serious injury or damage. follow the enclosed instructions and heed the warnings to ensure safe use. Model Number: