This coilover conversion kit will allow your normal oem or after market strut to Fully adjust the height. By converting to adjustable coilovers you can simply adjust the height to accommodate for aftermarket wheels. You can also simply raise or lower you car to desired height making a dramatic improvement in handling. This coilover kit is adjustable between 1-4" simply by adjusting the locking perches. Provides Better Handling, Improved Aerodynamics, And An Aggressive Appearance to your vehicle. Each set has carefully tuned spring rates to provide the optimal combination of precise handling. Will improve stability and give you a firm ride as well as comfort. (about 25-30% stiffer than stock) Necessary hardware such as Spanner Wrench, O-Rings and screws are included. There is general instructions that will be sent to you after purchase upon request, so instructions are not included with the set. 100% Brand New , never been used.