(d) HEAT TREATMENT: The grinding media is suitably heat treated to obtain the required hardness and Microstructure. (e) STANDARD SIZE OF GRINDING MEDIA: Balls diameter (mm) - 125,100,90,80,75,70,65,60,50,40,30,25,20 & 17 Cylpebs (mm)-25x25, 22x22, 19x19 OTHER TECHNICAL SPECIFICATIONS WILL CONFIRM TO IS 6079-1980