DIAMETER:60--200MM,LENGTH:3-6M,HARDNESS:HRC45-60 TYPE B: DIAMETER:60-150MM,LENGTH:3-6M,HARDNESS: HRC45-60 diameter: 60-200MM, length :3-10M,hardness :45-65 chemical elements: C: 0.52-0.7, Si: 0.17-0.37, Mn: 0.6-1.2, S: <0.035, P: <0.035, Cr: <0.04 The grinding rod