SMBT-5/8 CS/SS Solid Machined Ball Transfer Unit 5/8 Main BearingSMBT 5 8 CS SS Solid Machined Ball Transfer Unit 5 8" Main Ball Proudly made in the USA SMBT 5 8 CS SS Solid Machined Ball Transfer Unit, Main Ball is 5 8" Inch, 5 8" Main ball rotates on 3 32" support balls, SMBT 5 8 CS SS stud mounted ball transfer is a heavy duty ball transfer unit, capable of supporting as many as 33 pounds (per unit). SMBT 5 8 CS SS features a 5 8" inch ball bearing resting on 3 32 inch individual support bearings, making it