1.chain bush for motorcycle chain,industrial chain,engine chain 2.material:10#,20Mn 3.06B-16B NameNoMaterialChemistry compontentsCSiMnPSCrNiMoBush1SWRM6≤ ... and non-standard chain bush for motorcycle chains,industrial chains,engine chains,which can be heat treatment if you demanded. Why ... accordingly. 06B-16B chain bush for motorcycle chain,industrial chain,engine chain