Grinding media and ball milling has many uses, such as cleaning and preparing surfaces, tool and diesharpening, deburring and deflashing, maintenance, repair operations, and construction. Sort by. Filters . mm Zirconia Beads (1 kg) for DNA, RNA and Protein Extraction and Isolation. 795 00 Save 200 00. mm Zirconia Beads (100 g) for DNA, RNA and Protein Extraction .