According to the present situation of 9.75 4.88m SAG mill, since the grid plate hole is 60mm, so we suggest your company using 125 balls instead of original 120 ones, changing filling rate from 9-10% to 11-12%, so that it will be more effectively to increase the grinding quality and processing ore quantity. We are leading manufacturer and supplier of ADI grinding ball, austempered ductile iron grinding ball in China.