... 1:unbreakable , 2:even hardness 3:grinding resistant 4:high impact value Grinding Steel Ball:Application : Widely used in many ... and equipments .such as Bearings, hardware, electronics, iron, machinery and equipment, electric power, mining, metallurgy and other fields .Features :1) ... 130+4-2545771029030182140110DIA 140DIA 150+4-311278138718872 Common use high quality with various of material steel ball