... 240(1)It can make the abrasive tool to grind the great hardness material, such as the high speed steel, stainless ... used for sandblasting, such as precious metal, the gold, crystal, the glass and cowboy wear. JIS#280-JIS ... can be used in grinding and polishing the gold, silver jewellery, the eye glass, bearing and any kind ... 2)It can be used in manufacturing the superfinishing stone.(3)It can be used ...