1.High-quality stainless steel ball 1.ISO9000,SAE standard 2. ... originShandong,ChinaMaterialsbearing steel(GCr15/GCr15simn)/carbon steel(10/15/45/85)/stainless steel(OCr17Ni9/3Cr13/9Cr18)/chrome steel/nikel steel/bicycle steelsize0. ... combined efficiency of grinding millApplicationhardware, bearings, guide sleeves, guide rails, grinding materials, micro mists, polishing, decoration, toys, military ...