Grinding Media for grinding mills mineral processing Diameter: 50mm, 60mm, 70mm, 75mm, 80mm, 90mm 100mm 125mm Hardness: HRC55-65(Surface and Volumetric) or as per customers requirements Characteristics: High hardness, good wear resistance, no breakage. We use the special high carbon steel materials to produce the mill balls to ensure the good performance of high hardness and wear resistance applicable in ball mills.