1.High-quality stainless steel ball 1.ISO9000,SAE standard 2.many dimentions&materials long life,high precision 3.OEM Place of originShandong,ChinaMaterialsbearing ... --66Featuresa).Even hardness b).Unbreakable c).grinding resistant d).High impact value e).High combined efficiency of grinding millApplicationhardware, bearings, guide sleeves ...