... you needLife Time:10 Years Buying tipsThe most popular, the low speed, small power, can choose the A3steel Carburizing, quenching,tempering, HRC50 ... chain:C2040,C2060,CA650 Leaf chain;AL422,BL546,LH0822,LL1044 TOP chain:TT,TS,TP --our technology-- Heat treatment process,Electric ...