NB SW12G 3/4 inch Ball Bushings Linear MotionSW12G: Made in Japan: NB Linear Systems Nippon Bearing Linear Systems SW12G NB Systems Ball Bushings Linear Motion, 3 4" Bore linear motion ball bushings bearings, the inner diameter(bore) is 3 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: SW12G Linear Motion Ball Bushings Type: NB Systems Ball Bushings Linear