This is an EDSS kit (Equine Digital Support System) it is an adjustable system with lots of components. It enables you to screw on different heights of frog supports and different height rails to raise the heels up. It enables you to keep changing the components according to the needs of the horse after the shoeing process. The pad is also screwed to the shoe sucking the pad up towards the shoe relieving pressure around the tip of the pedal bone.