SMSF8UUE NB Round Flange Type With Pilot End Anticorrosion Miniature Slide Bush Made in Japan:NB Linear Systems SMSF8UUE NB Round Miniature Linear Slide Bush Miniature Slide Bush, Bearing is anticorrosion, Bearing is seals on both sides, The retainer material is steel, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), Made in Japan.