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This is called Magnetite Abrasive, it is used for grinding or polishing the granite stones, usually, it is equipped in the automatical grinding machine, which has 6-7 grinding heads, there are 6 pieces of magnetite abrasives in each grinding head.
This kind of polisher has rough grinding, fine grinding and polishing grinding, the grits are 8#-1500#.
There is a big market for this product because it is very cheap which save the cost of the stone products.
If you need more information, welcome to contact us at any time.
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