... to carry 4.WINDOWS operating system 5.directly mark cnc dot peen marking machine Product DescriptionPneumatic marking machine is a mechanical ... spare parts, machine tools, hardware products, metal, gears, pumps, valves, fasteners and their brands, ach kind of metallic tube, gear wheel ... )Air pressure 0.2-0.7MPaImpact Frequency130-300HZ SanYou cnc dot peen marking machine portable SY-40