... .Exquisite and convenient 4.marking materials of metal, chinaware, marble, glass, jade, etc DescriptionThe engraving pen is a new type of electronic ... the surface of almost all the hard materials, such as metal. ceramic, glass, plastic, marble and timber. It not only plays ... Φ3mm(hard alloy)Dimension150 x 65 x 40mmNet weight250gPacking weight300g metal surface electric engravor pen