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1 Inch to 5 Inch High Quality Forged Steel Balls for Ball Mill, Grinding Media Balls. Low Breakage Rate: Breakage rate is less than 1% for high durability. High Hardness Range: Hardness ranges from HRC 55 to 65 for superior grinding performance. Customizable Sizes: Diameter available from 15mm to 150mm to fit various mills. Multiple Material Grades: Offers 45#, 50Mn, 60Mn, 65Mn, B2, B3, BL, and BG grades. Fast Delivery: Delivery within 15-20 days after payment receipt. Free Sample Service: Free samples available for evaluation, excluding freight cost. ISO9001 Certified: Manufacturing process certified under ISO9001 standards. Global Export Experience: Products exported to over 40 countries with 15 years of experience.