Micro ENGRAVER by sparklingshamrock, $17.50 It is battery powered and about the same size as a large ink pen. It includes two round diamon tips bits and an allen key. The key to using this is not to press too hard - just use the same pressure as a pen. You can write cursive words, or droll scrolls, doo dads and designs. The micro engraver works not only on metal, but on glass, wood, ceramics. also engrave ipad, phone, etc. Takes two AAA batteries.