The Bilstein B8 5100 series (33-253190) is a high-performance 46mm monotube gas pressure shock absorber designed specifically for the rear of the Ford F-150. Ideal for lifted pickups and SUVs, these shocks feature a patented digressive valving system that instantly reacts to changing surface conditions. The lift-ready design ensures improved handling, stability, and comfort both on and off-road. Construction Details: Monotube design for consistent, fade-free performance; Zinc-plated finish for resistance against harsh elements. Included in this package: 1 x Bilstein 33-253190 Rear Shock Absorber.