on the shock....there is the seat where the spring sits....then on the shock there are circular cuts. Then you have this big c-clip and you can put the c-clip in the circular cuts and this will lower or raise the seat of your spring aka lowering or raising our car. Its hard to explain, but if you were trying to be a smart ass, go and check out eibach yellows and they will say, adjustable up to "some number" millimeters. And the rears are the same.