- Firewire™ niti alloy is an innovation in file metallurgy. - It makes our files more flexible and significantly increases resistance to cyclic fatigue. - Parabolic cross section. - Highly flexible. - High strength. - Speed: 300-500 rpm ( clockwise rotation). - Torque: 250-400 N.cm. - Length: 21mm. **For further product information, please contact Chat Support**