Pen Scriber For Marking Metal, Glass and Plastic. This is a new pen scriber. It has a 1/8" (3 mm) scribe. One end has a very strong magnet for picking up metal parts and the other end is carbide steel. This is used for marking all metals, glass, lapidary stones, wood, plastic or any other item you need to mark. Has anodized aluminum handles, knurled for a firm grip with pocket clip. Made in the USA.