... convenient 4. metal, chinaware, marble, glass Electric Engraving Pen for Promotion1.Personalize your valuables and add decorative flourishes to ... to deep grooves.2.the engraving pen is tungsten alloy, is very durable.3.the switch of the engraving pen is in hand grip ... place. TypeYSSB-IIPower supply voltage220V/50HZTotal power15W,0.4ADiameter of the nib ...