... 4.Customizable 5.OEM offer lc135 Galvanized sprocket CNC line powerful and trustworthy Brand:Qidong10Years of production ... frequency hardening,carburizationSurface treatmentSand plating,zinc plating,grind,polish,CNC lineAll special color is welcomed -- Chain--main specification ... BL546,LH0822,LL1044 TOP chain:TT,TS,TP --our technology-- Heat treatment process,Electric galvanizing process, Nickel plating ...