... mm)Diametrical tolerance(mm)Weight of Singleof grinding ballin averageNumber of piece ofOne ton grinding ballin averageImpacttoughnessDIA 20DIA 25DIA 30DIA 40DIA 50 +2 ... ) 5. Products Name: Forged Grinding Ball, Forging Grinding Ball, Forged Ball, Forging Ball, Forged Steel Ball, Forged Grinding Steel Ball, Forged Steel Grinding Ball, Cast Grinding Ball, Casting Grinding Ball, Casted Grinding Ball, ...