As the performance level of precision machinery has risen, the range of the applications using ball bearings has become broader, and the demand for higher performance and durability of ball bearings has increased. lndustrial needs for ball bearings having high anti-corrosion technology and the ability to withstand fierce conditions while maintaining the preciseness of ball bearings originally required have also increased. "SMT" brand stainless steel ball bearings are the products to comply with present industrial needs.