- For preliminary and coarse polishing. - Ceramic-bonded grinding wheel, based on refined corundum. - For preliminary and coarse polishing. - Hardness: tender. - Granulometry: rude. - Recommended rotation speed: 15,000 min -1. - Form: paraboloid, elongated. - Maximum rotational speed:30,000 min -1. - Color: brown. - Rod length: 35. **For further product information, please contact Chat Support**