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• 30" Sprint Car Reactor Hollow Torsion Bars • Includes (2) TREX locking end plugs, designed to prevent arms or stops from being pulled off the bar • Constructed from high-grade 4340 steel • CNC-machined & heat treated • Smoother transition from effective length to bearing shoulder • Wide selection of rates ranging from .925 to 1.050 • 30" Length x 1-1/8" Spline