JDM racing performance adjustable coil over lowering spring kit (scaled) . Can be lowered between 0-3" simply by adjusting the locking perches . Simply raise or lower your car to desired ride heights for dramatic improvement in handling & looks . Provides better handling, improved aerodynamics, and an aggressive appearance on the track or street . Each set is carefully tuned to provide the optimal combination of precise handling, outstanding stability, and firm ride comfort . About 25-30% stiffer than stock. Spanner wrench, O-rings and screws included . Includes scaled measurements for precision tuning of a balance height for all corners.