SMS25GUU-OP 25mm Open Slide Bush Ball Linear Motion BearingsSMS25GUU OP Stainless Steel Anticorrosion Slide Bush Made in Japan: NB Linear Systems Nippon Bearing Linear Systems 25mm Stainless Steel Anticorrosion Linear Slide Bush, It is open and seals on both sides, The retainer material is resin SMS25GUU OP bearing is a high accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Item: SMS25GUU OP Bearing Type: Linear Slide Bush Closures: Open