SMSF6GUUE NB Round Flange Type With Pilot End Miniature Anticorrosion Slide Bush Made in Japan:NB Linear Systems SMSF6GUUE NB Round Flange Type With Pilot End Miniature Linear Slide Bush, Bearing is anticorrosion, Bearing is seals on both sides, The retainer material is resin, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan.