NB SW20G 1 1/4 inch Ball Bushings Linear MotionSW20G: Made in Japan: NB Linear Systems Nippon Bearing Linear Systems SW20G NB Systems Ball Bushings Linear Motion, 1 1 4" Bore linear motion ball bushings bearings, the inner diameter(bore) is 1 1 4" inch dimensions with a resin retainer, bearing is high accuracy grade linear bushings, series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Item: SW20G Linear Motion Ball Bushings Type: NB Systems Ball Bushings Linear