NPBT-1 1/2 CS Pip Mounted Ball Transfer Unit 1-1/2" Main Ball Proudly made in the USA NPBT-1 1/2 CS Pip Mounted Ball Transfer Unit, Main Ball is 1-1/2" Inch, 1-1/2" Main ball rotates on (90) 3/16" support balls, PBT-1-1/2CS allows positioning on a 2" pipe pedestal in front of shears or press breaks..