Number Of Ball Circuits: 6. KB50AJ NB Clearance Adjustable Type:Slide Unit Made in Japan:NB Linear Systems KB50AJ NB Clearance Adjustable Type Bearing, the inner diameter is 50mm, Series mainly used in the USA, NB brand (Nippon Bearing Linear Systems), made in Japan. This item is in the category "Business, Office & Industrial\Industrial Automation & Motion Controls\Mechanical Power Transmission\Bearings & Bushings\Bearing & Bushing Parts\Other Bearing & Bushing Parts". The seller is "irvineman" and is located in this country: US. This item can be shipped worldwide.