... as Bearings, hardware, electronics, iron, machinery and equipment, electric power, mining, metallurgy and other fields .Features :1) We ... cooperation. diameter(mm)Diameteicaltolerance(mm)Weight of Singleof forging ballin averageNumber of piece ofOne ton forging ballin averageSurfacehardnessImpacttoughnessDIA 20DIA ... 150+4-311278138718872 Common use high quality with various of material steel ball