Cutting wheel were widely used in grinding, chamfering and removing the surface of various materials and cutting off copper, stainless steel, non-ferrous metal, stone, refractory materials, glass and so on. The users should choose the suitable wheels according to the sepcification and the rotating speed. Both the rate range of use and the rotating speed(peripheral speed) were printed on the trademarks of the wheels, there are two kinds of rotating speed, 4300meters/min(72m/s) and 4800 meters/min(80m/s) respectively, of which 6000meters/min(100m/s) is for high-power and high-efficency grainders.