The wheels are mainly used for grinding all kinds of crankshafts and camshafts of auto , tractor , ship engine , as well as transport machinery , etc . The wheels have uniform hardness . their static balance performance is superior to the national standard specified value 30%-50% the thickness deviation of a group crankshaft grinding wheels is not more than 0.2mm .The parallelism tolerance of two end faces is not more than 0.1mm. It has reached the international advanced level.