1. Material: brass 2. Precision chuck 3. Precise positioning 4. Screw drive, save labor 5. More convenient operation and more efficient drilling 6. High concentricity, precise closing, stable and not easy to slip 7. Suitable for perforating walnut, dentin, bone, amber, beeswax 8. Used for manual mechanical drilling, which is safer than electric tools 9. Weight: 31g 10. Length: 121mm 11. Specifications: 0.3-2.0mm
