Alumina Abrasive 1. Good self-sharpening ability 2. Low abrasion 3. Suitable for grinding & polishing 4. Low price ceramic ... grinding balls are the indispensable additives for metal grinding and polishing. There are various kinds of ceramic grinding ... vibratory grinders, rotating grinders, drum-type grinders, and magnetic grinders, and they can effectively de-burr, trim, chamber, grind ...