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