Wasp Concrete Engraver Touch Up Tool - Pneumatic Air Scribe and Metal Engraver Used for Engraving, Carving, Drawing & Touch-up Tool for Concrete, Stone, or Statuary The tip reciprocates- it is Not rotary making it very easy to control. With a variable speed and impact the Wasp is great at tight intricate work. Safe: The tungsten carbide tip can be touched with no personal injury- it doesnt cut soft things. Also used for fossils, paleontology, lapidary, metal, plaster, and other hard surfaces.