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RTZ lowering coil springs are engineered to lower your pickup 3" while maintaining the Handling & Ride quality of sport suspension. These coils are heat set to prevent spring fatigue, load tested for proper load specification & sport spring rate, and are made of High Tensile Alloy Steel. All these stages of refinement are implemented at our facility in the USA. Drop them in and Drive!! NOTE:PLEASE INSPECT PARTS BEFORE BEGINNING INSTALLATION. WE SUGGEST A PROFESSIONAL INSTALLER WITH PROPER EQUIPMENT TO HANDLE EXTREME LOADS AND THAT HAS TRAINING IN SUSPENSION SAFETY.