Our Top rollerMaterialis40Mn2,Production TechniqueisForging,Heat Treatmentiswhole quenching and tempering, and surface hardening,HardnessisHR40-50 Our LS218RH5 Top Roller Photoes: SUMITOMO Model Top Roller we can produce: SC350, SC400, SC500, SC500-2, SC550-2, SC650, SC650-2, SC650D...