Zhongshan H. R. T. Precision Steel Ball Co., Ltd is a leading manufacturer of precision steel balls in China. We have the ability with bearing steel (AISI52100), stainless steel (304, 316/316L, 420, 440/440C), carbon steel, glass, plastic and copper to manufacture precision balls up to G5, Balls are manufactured from. 039" (1mm) to over 10" (254.0mm). The H. R. T. Company has a plant covering 1, 000 square meters. Our technologies is ISO 9001, ISO 14000 and TS 16949 certified.