LMB487296 3 inch Linear Motion Ball BushingLMB487296: Made in Japan: NB Linear Systems Nippon Bearing Linear Systems LMB487296 3" Bore linear motion ball bushing bearing, innerdiameter(bore) is 3" inch dimensions with steelretainer, Bearing is a high accuracy grade linear bushing,series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Number of ball circuits: 6 Size: 3" x 4 1 2" x 6" inch Inner Diameter: 3" inch Outer Diameter: 4 1 2" inch Length: 6" inch