General description Durable and versatile, the CSPARKV 4 Pack Tungsten Carbide Scriber Pen is designed for precision marking on various hard materials including glass, ceramics, and hardened steel. Its tough tungsten carbide tip ensures longevity and effectiveness in demanding tasks. Technical specifications Tungsten carbide tip for durability Designed for use on wood, metal, plastic, ceramics, and glass Usage Provides precise fine line marking capabilities Other information Package includes: 4 packs of tungsten carbide scriber pens Convenient pen design with pocket clip for easy carrying Anti-fall handle for maximum control and comfort Self-contained chuck with reverse safety