Hillman 25 in. x 160 lb. Extension Spring w/Safety Cables Brown is designed to provide reliable support for your garage door by counterbalancing its weight as it operates. These extension springs are typically mounted along the sides of the door or above the horizontal tracks, stretching and contracting to ensure smooth door movement. I for residential garage doors, which usually have one spring on each side, this product also suits commercial doors that may require multiple springs on each side. The package comes complete with instructions, mounting hardware, and essential safety information to guide proper installation. Please note that incorrect installation or improper door positioning can lead to serious injury or death, so it is crucial to follow all warnings and enclosed instructions carefully. Model Number: