Much lighter and easier to control than flex-shaft powered or plug-in engravers, this battery-powered engraver is ideal for fine work. It can be used effectively on steel, ceramic or glass and is the best we have found for engraving slate. The 3/64" (1.3mm) diamond ball tip is easy to control, primarily because it has virtually no vibration. The rotary cutting action will not chip or shatter materials as a reciprocating engraver can.