The Bilstein B6 2001 BMW 525i Base Wagon Rear 46mm Monotube Shock Absorber is a high-performance, direct-fit shock absorber designed specifically for the 2001 BMW 525i Base Wagon. This shock absorber is made with a 46mm monotube design that provides superior handling, precise steering response, and improved stability. The monotube design also ensures fast and consistent dampening response, allowing for optimal performance in any driving conditions. Additionally, the shock absorber is corrosion-resistant and features a self-adjusting deflective disc valving system for maximum control and comfort.