Enables precision cordless engraving anywhere by anyone from professional technicians and mechanics to homeowners and DIYers (do it yourselfers). Diamond tip bit, 20,000 RPM (revolutions per minute) motor. Protect all types of valuables with identifying markings and even perform delicate personalization of items. Engraves glass, metal, ceramic, and plastic. Aluminum body offers superior durability and the one-of-a-kind tri-lobe ergonomic grip provides the ultimate in comfort and ease-of-use. Uses standard engraving bit. 2 AAA batteries included.