Engraver Pen - Diamond Tip Protect your valuables with permanent, personalized identification High-speed stylus glides effortlessly across metal, glass, plastic; like writing with a pen! Ultra-hard diamond tip engraves virtually any surface - even heat-treated metal About the size of a permanent marker, weighs just 3 oz; powered for hours on 2 AA (not included) Finger-tip power button for easy control; extra-fine 1mm permanent diamond stylus