Overall Length: 6-1/2"Power Source: (2)AA Batteries (included)Speed: 20,000 RPMEngrave Or Decorate A Wide Variety Of Materials Including Metal, Plastic, Glass, Ceramic, Wood And LeatherCompact Engraver Has Ergonomic Tri-Lobal Grip And Precise Fingertip For Easy ControlSingle Speed Control For Full Time 20,000 RPM OperationIncludes Standard 3/32" Diamond Tip Bit