The RingedHole GCD Type is created only for routings which contain Turning processes (Lathes) and is used to support parts with internal turned geometry. It includes a SimpleHole GCD which represents the smallest interior diameter of the part, and one or more Ring GCDs which represent additional internal co-axial volumes. The RingedHole GCDs is available for the Bar & Tube, Casting, and Forging process groups.