Engraving set with interchangeable tips for engraving various materials such as iron, steel, glass, non-ferrous metals, stone, ceramics, plastic, wood, etc. Signograph 25 Diamond Set Electric Engraver - engraving as easy as writing. Signograph 25 Diamond, supplied in a set with diamond, hard metal and hardened stylus, as well as two modeling pens for soft metals such as copper, tin and aluminum foil. Vibration strength: a (peak)~= 74.02 m/s² = 7.545 g (max. peak value) a (rms)~= 52.34 m/s² = 5.336 g (max. effective value). In a colored sales box.