With the new General Tools & Instruments Cordless Precision Engraver, No. 505, users can protect all types of valuables with identifying markings, and even perform delicate personalization of items. The precision specialty tool uses a standard 3/32" diamond-tipped engraving bit, enabling engraving anywhere by anyone. Its powerful 20,000 rpm motor is powered by two AAA batteries and enables engraving in glass, metal, ceramic and plastic. An aluminum body offers superior durability while the one-of-a-kind tri-lobe ergonomic grip provides the ultimate in comfort and ease-of-use.