Specifications and Dimensions: Wire Diameter: 0.25 inch (6.35mm); Inner Diameter: 2 inch (50.8mm); Number of Coils: 120; Coil-to-Coil Length: 30 inch (762mm). Please confirm that the wire diameter and length are identical to your original garage door torsion springs for time-saving replacement. Sturdy and Durable: Our garage door springs are made of professionally heat-treated spring steel coils and aluminum cones. With advanced electrocoating surface treatment, they boast excellent corrosion resistance and wear resistance, eliminating the need for additional lubrication and providing a longer lifespan. Extended Lifespan: This garage door torsion spring can effortlessly endure over 16,000 cycles and maintains its elasticity for 3 years without significant deterioration, ensuring a strong, durable, and stable performance. Easy Installation: Our garage spring comes with imprinted sizes and left/right labels, accompanied by anti-slip installation bars and gloves