... weight 2.Easy to operate 3.Exquisite and convenient 4.marking materials of metal, chinaware, marble, glass, jade, etc DescriptionThe engraving pen is ... 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