General Tools Tungsten Carbide Scriber and Magnet, General's 88CM has long been held as the industry standard for scribing and etching tools. The tungsten carbide tip performs flawlessly on even the hardest metals, and therefore works easily on ceramics and glass as well. A powerful magnet at the tool's cap quickly cleans up stray metal shavings that can damage your work piece. The 88CM also features a reversible/removable tip, and a pocket clip for working in the field.