Designed for reliability and ease of use, these Reliabilt extension springs are ideal for 2-car garage doors and offer dependable lifting power for doors weighing up to 140 lbs. Each spring features a blue color code that clearly identifies its weight-bearing capacity, ensuring proper selection and installation. For enhanced safety, a 122-inch internal safety cable is included to help prevent injuries from potential spring breakage. This set also comes with complete installation guidelines and all necessary hardware, making setup simple and straightforward.