... hard,4.Very fast and smooth cutting performance, 5.Clean cutting,better surface finish,6.Thickness is thin,the cutting edge is narrow, effective on ... high tensile metal,alloy steel, quench steel, tool steel,mild steels,cast steels and hard iron casting metal2)the industry maybe use ... of machine, does not exceed speed marked on wheel.3.Do check mounting flanges for equal size,relieved as required and ...