... earlier to apply for boring and milling machine tools and machining centers. The features of the system are the tools connecting ... drilling, reaming, boring, milling and tapping,which is a perfect machining tooling system.At present for the taper 7:24 our ... ISO,GB,JIS(MAS),ASME(ANSI),DIN,OCT etc.and five specifications 30,40,45,50 and 60.Besides the specifications ...