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1 Inch 2 Inch 3 Inch Copper Mining Grinding Ball. Customized Production: Full customization available from samples, designs, and minor adjustments. High Hardness: Hardness ranges from HRC 55 to 65 for superior grinding performance. Low Breakage Rate: Breakage rate is strictly controlled below 1% during operation. Diverse Material Grades: Available in 45#, 50Mn, 60Mn, 65Mn, B2, B3, BL, and BG grades. Wide Size Range: Diameter options from 15mm to 150mm for various mill applications. High Impact Toughness: Impact toughness exceeds 17 ak.J/Cm^2 for durability. ISO9001 Certified: Manufacturing process certified under ISO9001 quality standards. Fast Delivery: Delivery within 5-10 days for stock items, 15-20 days for custom orders.