LME20UUAJ Linear Ball Bushing Works with 20mm Shafts 20x 32x 45 mm LME20UUAJ adjustable Linear Motion Ball Bushing works with 20mm shafts, this is an adjustable sealed linear ball bushing, with the inner diameter of 20mm, outer Diameter of 32mm, and a length of 45mm, the LME20UUAJ can be used in many CNC router applications, like CNC wood router, plasma and any application that requires smooth linear motion and positioning.