SWS24 NB 1-1/2" Ball Bushings Linear MotionSWS24 NB Systems Ball Bushings Linear Motion 1 1 2" inch Inner Diameter SWS24 linear motion ball bushing bearing, bearing inner diameter is 1 1 2" inch, bearing has steel 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. SWS24 Ball Bearing NB Systems Ball Bushings Linear Motion Shaft Diameter: 1 1 2" inch Number of Circuits: 6