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HanchenStainless Steel Grinding Balls Media Beads250gLab Ball Mill Grinding MediaforLab Planetary Ball MillDia. You Prefer 0.5150mm Optional, 201 This fits your . Make sure this fits by entering your model number. Please NoteWe have 201, 304, 316, 316L, 420, 440, 440CStainless Steel Grinding BeadsDiameter 0.5150mm in stock.