● Outer Diameter：20 mm - 300 mm
● Material：DIN CK45, SAE1045, JIS S45C, JIS STKM13C, SAE1026, ST52,20MnV6, 42CrMo4, 40Cr, AISI 304, AISI316, AISI 431
● Tolerance：ISO f7, f8
● Chrome layer thickness：25(+/-5)μm
● Roughness：≤0.2μm
● Hardness：850-1150HV
● Straightness：≤0.2/1000mm
● Roundness：Half of the diameter tolerance