Important safety notice: Garage door spring replacement is dangerous work that should only be done by experienced professionals! That said, if you're a qualified technician, these Aspaton torsion springs are built to last. This set includes 2 high-carbon steel springs measuring 0.192-inch wire size, 2-inch inside dimension, and 16-inch length, plus 2 non-slip winding bars for safe installation. Rated for minimum 15,000 cycles, these springs feature precision electrophoretic coating that resists corrosion and extends service life. The aluminum cones are heat-treated for durability and secure connection to brackets, reducing wear over time. Before ordering, carefully measure your existing springs to ensure proper fit - getting the right size is crucial for safe operation and proper door balance. These professional-grade springs provide reliable performance and consistent tension for smooth garage door operation. The included winding bars feature non-slip design for better control during the tensioning process. Remember, improper installation can lead to serious injury or property damage, so if you're not 100% confident in your skills, hire a professional garage door technician. For those qualified to do the work, these springs offer quality construction at a reasonable price.