specification of the steel rolling machine(new , second) ö650mm, ö500mm, ö450mm, rough rolling mill group, ö400mm rough rolling mill group and medium rolling mill group, ö320mm medium rolling mill group , ö300 medium rolling mill group , ö280mm, ö250 mm, ö220 finishing rolling mill group .(note: all the groups include motor, speed reduction unit, link-up, guide rail, roller etc.)