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One 1.5" I.D. core die made of hardened steel and highly polished with hardness HRC 60 - 62. Ra 0.08m highly polished steel. ... 50mm Grinding Ball with best price.Inquire Now Grinding Media Steel Ball at ... Than 30 Years Highly Efficient Rod Mill Fote Machinery1 The rod mill usually uses a steel rod with a diameter of 50-100 mm as a grinding ...