... ,yanmar,John deer,foton,class,etc diffusion knife1)High quality,low price2)Material 65 Mn3)Usage kogoba,yanmar,John deer,foton,class ... ,etcThe diffusion knife is 45-50 HRC,material is 65Mn(1566),Process:Forging,and the diffusion knife is ... factory to visit and any sample or drawing is welcome . good quality low price diffusion knife