SMD series is a kind of saw grade industrial diamond product for sawing of stone, concrete and geological drilling. This type fo product is suitable for making frame saw, wire saw, muti-blades and drill bits. Workpieces range from hardest granite, asphalt, refractories and reinforced concrete to softer marbles, limestones and lightweight building materials. The premium grade SMD5190, 5180, 5160 are ranked the prefect cubo-octahedral crystalline, the crystal also have favorable transparency and purity, highest toughness, perfect thermal stability and impact resistance. The medium grade SMD5140, 5130 are ranked the high percentage of whole cubo-octahedral crystalline, low inclusion and high toughness. The econimic grade SMD5125, 5120, 5115 and 5111 are disegined for medium load application, the whole crystalline percentage is lower than above two types.