Hillman 25 in. x 70 lb. Extension Spring w/Safety Cables, Orange is designed to provide reliable counterbalance for your garage door. These extension springs are mounted along the sides of the garage door or above the horizontal tracks, stretching and contracting as the door operates to ensure smooth and balanced movement. Typically, residential garage doors use two extension springs, one on each side, while commercial doors may require multiple springs on each side for added support. This package includes all necessary instructions, mounting hardware, and important warning and safety information to help ensure proper installation and safe operation. Please note that incorrect installation or door positioning can cause serious injury or death, so it is crucial to follow the enclosed instructions and warnings carefully.