ball mill inch chrome plated steel grinding media pcs. diameter, heavy chrome plated steel ball bearings. use in place of lead balls where contact wit.. $24.95.tumbling. better way of polishing stones is to use a tumbling machine these are small electrical units, using silicon carbide grit as mentioned above. rough stones, of equal hardness, are put in a barrel with water and grit and the barrel is slowly rotated.rock tumbler electronic edu-science limited. item no.: rock tumbler ages AC adaptor included. rock tumbler includes: oz. gemstone rocks step coarse grinding powder step finefeb 14, 2018 typical small rock tumbler these small rock tumblers are readily available, popular, inexpensive tools for use in the rock-polishing hobby. put some rocks and grinding media in along with some water, and after hours or days, out come nice, pretty, shiny rocks.
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