1. Material: short drill bit - alloy; ong/extraction drill bit - tungsten steel
2. Shank diameter suitable for most polishing pens and extractors
3. High hardness, high temperature resistance, good stability
4. Clamping shank diameter: 2.35mm
5. Product comes with a plastic packaging box for easy storage
6. Operating instructions: The drill bit is relatively thin; please operate with care. Slight deviations may cause the head to break, which is not a quality issue. Please be aware of this.