... hardness-45-50HRC Excellent in quality standard or customized blank punch Productsprecision mould parts, standard and customized punches, guide pins ... cylindrical grinder, Inner-aperture grinder, CNC grinding machine, CNC milling machine, polishing machine, engine lathe, Quadratic element, Projector ( ... Plus or Minus tolerances.2. Type of material and hardness needed.3. Part application.4. Target ...