1. Alloy steel special for main shaft. 12152. Service: quenching and tempering, turning, milling, Grinding, Nitrogenization.3, Size: Dia 70mm, 80mm, 100mm, 4. HRC:48 degree5 Milling Machine, GrindingThis is Freda from HK Dwin industrial co.ltd, we have a CNC Machine shop factory In China, We are...