... Crankshaft grinding wheel: Germany, the United States, Japan and domestic mill crank machine tools, grinding wheel specifications Φ400 ... carbide, optical glass, gem, semi-conductor materials, non-ferrous materials and non-metallic grinding, cutting or electrolytic grinding. ... , USA, SA, Botswana, Namibia and other countries and areas . 6.Main areas:North America,Eastern Europe,Southeast Asia,Africa, ...