SWS8G NB 1/2 inch Ball Bushings Linear MotionSWS8G NB Systems Ball Bushings Linear Motion 1 2" inch Inner Diameter SWS8G linear motion ball bushing bearing, bearing inner diameter is 1 2" inch, bearing has resin retainer, bearing is anticorrosion, Bearing is a high accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Item: SWS8G Ball Bearing Type: NB Systems Ball Bushings Linear Motion Shaft Diameter: 1 2" inch Number of