NSMBT-1 CS Stud Mounted Ball Transfer Unit 1" Main Ball Proudly made in the USA NSMBT-1 CS Stud Mounted Ball Transfer Unit, Main Ball is 1" Inch, 1" Main ball rotates on 1/8" support balls, NSMBT-1 CS stud-mounted ball transfer is a heavy duty ball transfer unit, capable of supporting as many as 33 pounds (per unit). NSMBT-1 CS features a 1" inch ball bearing resting on 1/8 inch individual support bearings, making it ideal for most industrial transfer applications. NSMBT-1 CS ball transfer is also useful for a number of different applications where traditional wheel casters are used, including retail store displays.