NB TW24 NB Self Aligning Ball Bushing 1-1/2" Linear Motion BearingTW24 Self Aligning Top Ball Linear Bushing High Load 1 1 2" ID x 2 3 8" OD x 3" Length Made in Japan by NB Linear Systems The TW24 Top Ball bushing is a high load linear motion bearing built for long life and smooth tracking. Manufactured in Japan by NB Systems, it features a 1 1 2" inch bore and supports up to 27x the travel life of standard bushings. With five internal ball circuits and self aligning capability, its ideal for CNC machines, automated