... / MDK series used in grinding bore diameter, outer diameter, broach, thread, etc. Our types as follows:MD / MDF / MDT / MDS / ... MDK series used in grinding bore diameter, outer diameter, broach, thread, etc.XD / XDS / XDJ series used in general parts, carpenter ... metal such as aluminum and copperLD series used in machining inner thread copper pipe for heat exchanger of air condition equipmentXP / ...