NSBT-1 1/2 CS/SS Stud Mounted Ball Transfer Unit 1-1/2" Main Ball 3/8"-16 Threaded Stem Proudly made in the USA NSBT-1 1/2 CS/SS Stud Mounted Ball Transfer Unit, Main Ball is 1-1/2" Inch, 1-1/2" Main ball rotates on (90) 3/16" support balls, BT-1-1/2CS stud mounted ball transfer is a heavy duty ball transfer unit, capable of supporting as many as 250 pounds (per unit). SBT-1-1/2CS features a 1 and 1/2 inch ball bearing resting on 90 individual support bearings and is ideal for most industrial transfer applications. SBT-1-1/2CS ball transfer can also be used in a variety of non-industrial applications, including retail store displays and airport luggage transfers.