SMSF8GWUUE NB Round Flange Double Wide Type Miniature Anticorrosion Slide Bush Made in Japan:NB Linear Systems SMSF8GWUUE NB Round Flange Double Wide Miniature Linear Slide Bush, The retainer material is resin, Bearing is anticorrosion, It is seals on both sides, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan.