LBB12 3/4 inch Linear Motion Ball BushingLBB12 : Made in Japan: NB Linear Systems Nippon Bearing Linear Systems LBB12 NB Systems Ball Linear Motion Bushing , 3 4" Bore linear motion ball bushing bearing, the inner diameter(bore) is 3 4" inch dimensions with a resin retainer. series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. Item Number of ball circuits Dimensions(Inches) Eccentricity radial clearance basic load rating dr D L B W D1 inch tolerance inch mm