Our garage door torsion springs are made of high carbon steel 82B and cast aluminum ADC12, creating a winning combination that ensures exceptional performance and endurance. Upgrade your garage door system today with these reliable, long-lasting springs. The high-precision dies ensure consistent wire diameter and elasticity for unparalleled stability. The thickened cast aluminum ADC12 adjustment and fixed blocks are sturdy and durable. Experience the difference with professionally heat-treated spring steel coils and aluminum cones, engineered for maximum strength and durability. With enhanced fatigue resistance, the garage spring provides a lifespan of over 16,000 cycles, equivalent to maintaining stable elasticity for 3 years.