... carbon steel , cold and hot round steel , screw thread steel ,flat steel,angle steel and square steel . ( need to make knife ... ,high speed international standard motor and firm reinforcing covering.This machine is small, solid ,lubricant better,little power loss,opration easy ... diameter:6-40mm2.grade screw thread rebar diameter:6-32mm3.Flat steel max. diameter:70×15mm4.Cutting square steel max. spec ...