... -JIS#240(1)It can make the abrasive tool to grind the great hardness material, such as the high speed steel, stainless steel and ... .(2)It also usually used for sandblasting, such as precious metal, the gold, crystal, the glass and cowboy wear. JIS#280-JIS#4000 ... ,3-5,5-8mm and 180,200,240,280,320F First grade white fused aluminium