... and convenient 4.marking materials of metal electric engraving pen Machine featureElectric engrave pen is new style elcectrical ... metal, chinaware, marble, glass, jade, crystal, plastic,wood etc.. Engraving the words, mark, pattern, the device can turn the button ... by the sub-five, to meet the different materials of engraving. Machine parameterVoltage Range :220V/50HZNib: diameter 3mm(hard alloy ...