SGS 420 High precision stainless steel balls 1)100% origibal 2)good wear resistance ... of Origin: Jiangsu China (Mainland)Brand Name: SAIGEMaterial: Stainless SteelProduct Name: stainless steel ballMaterial: AISI304,316,316L,420,440,200,202MDiameter ... , the service also includes detailed! Products show stainless steel ball is used in many special industry as iatrical instrument,chemical industry ...