NB TW12 SK Self Aligning ANTI Corrosion Ball Bushings 3/4" Linear MotionTW12 SK Anti Corrosion Linear Ball Bushing 3 4" x 1 1 4" x 1 5 8", Self Aligning, Made in Japan The TW12 SK Top Ball bushing is a high load linear motion bearing built for precision motion in demanding setups. With its 3 4" bore and anti corrosion design, it delivers long service life and smooth tracking great for CNC systems and industrial automation. Inner diameter: 3 4" inch Outer diameter: 1 1 4" inch Length: 1 5 8" inch 6 ball circuit system for