SMSK25WUUE NB Square Flange Double wide Pilot End Slide Bush Anticorrosion Made in Japan:NB Linear Systems SMSK25WUUE NB Square Flange Double wide Pilot End Linear Slide Bush, Bearing is anticorrosion, The retainer material is steel, It is seals on both sides, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan.