... gray iron ASTM G3000,GG20,HT250,Stainless steel,ductile iron2.Car make: European cars,Japanese Cars,American Cars etc3.Passed ... increased cooling.Holes are countersunk which reduces heat build up.7:Method of manufacturing: one kind is normal turning, ... GG20,HT250,Ductile iron etcCar MakeAmerican Cars,Japanese cars,European Car etcHardness180-240HBPackingplastic bags + kraft paper box (Customer brand ...