Bilstein B8 5100 (Ride Height Adjustable) shock absorbers are designed for trucks and SUVs with a front OE coilover style suspension. Multiple snap-ring grooves in the body allow for different spring seat positions, providing 0-3 inches of front lift with OE springs (depending on application). The monotube shock absorbers feature a 46mm digressive piston a with self-adjusting deflective disc valve setting. Bilstein B8 5100 (Ride Height Adjustable) shock absorbers provide increased wheel travel and improved handling. Utilizing a B8 5100 (Ride Height Adjustable) shock absorber is the easiest way to level out your vehicle. Specifications: Collapsed length (in): 15.91 Extended length (in): 20.22 Collapsed length (mm): 404.0 Extended length (mm): 513.5 Finish: Zinc plated Reservoir: No Body design : Snap ring grooved body (coilover) Body diameter (id) : 46mm Spring seat included : Yes Adjustable damping : Non-adjustable Position: Front Notes: Provides 0-2.3" front lift. Without Adaptive Variable Suspension (AVS).