Product Characteristic : The characteristic is provided and same with hard chrome plated steel bar. In addition, it can reduce weight

Steel grade JIS STKM 13 A, JIS STKM 13 C, SAE 1020
External Diameter H7, f7, H8, f8
Chrome Thickness (in my) : 20 m 5%
Surface Hardness : HV800 minimum
Surface Roughness : Ra 0.1m ~ 0.3m