- ISO 038/032. - Grit: Black/super coarse. - Only for dental use. - Natural emery powder, with high hardness, can ensure the drill sharpness. - High quality stainless steel stem, high strength, no rusty. - Can be disinfected under high temperature and high pressure. - MAX. speed 160,000 rpm. - EX stands for special shape. **For further product information, please contact Chat Support**