1. Durable materials: This glass scriber has a durable tungsten carbide tip and an aluminum blade body, and it is able to scribe hard materials, such as hardened steel, stainless steel, and glass. 2. Permanent magnets: These scribing tools are equipped with permanent magnets that can attract iron and steel chips in hard - to - reach places. 3. Easy to use: With a convenient pen - style design and a handy pocket clip, the knurled aluminum handle offers good controllability and comfort. When not in use, the tungsten carbide tip can be reversed and stored. 4. Wide range of uses: These tungsten carbide scribers can be used to scribe and etch various types of materials, like metal, glass, concrete, gemstones, tiles, ceramics, plastics, etc. The tool provides a precise fine - line marking function. It can also be given as a gift to carving enthusiasts. 5. Color: Silver 6. Material: Metal 7. Package contents: - 4 tungsten carbide scribers - 8 marking heads Only the above package contents are included, and no other products are included. 8. Precautions: Light reflection and different monitors may cause the color of the item in the picture to be slightly different from the actual product. The allowable measurement error is plus or minus 1 - 3 cm.