BT-1 CS/SS Flange Ball Transfer Unit 1 Main Ball USA Mounted BearingBT 1 CS SS Flange Mounted Ball Transfer Unit 1" Main Ball Proudly made in the USA BT 1 CS SS Flange Mounted Ball Transfer Unit, Main Ball is 1" Inch, 1" Main ball rotates on (80) 1 8" support balls,BT 1 CS SS is is a heavy duty ball transfer unit, capable of supporting as many as 75 pounds (per unit). BT 1 CS SS Bearing Ball Transfer unit Ball Material: Stainless Housing Material: Carbon Steel Support Ball: Stainless Load Capacity: 75 LBS Quantity: 1