NBT-1 1/2 CS/SS Ball Transfer Unit 1 Main Ball USA made BearingNBT 1 1 2 CS SS Flange Mounted Ball Transfer Unit 1" Main Ball Proudly made in the USA NBT 1 1 2 CS SS Flange Mounted Ball Transfer Unit, Main Ball is 1" Inch, 1 1 2" Main ball rotates on (90) 3 16" support balls, NBT 1 1 2 CS SS is flange mounted ball transfer is a heavy duty ball transfer unit, capable of supporting as many as 125 pounds (per unit). NBT 1 1 2 CS SS Bearing Ball Transfer unit Ball Material: Nylon Housing Material: Carbon Steel