You will find the right ball transfer unit for you here!

From mini ball transfer units with ball Ø: 4.8 mm to heavy-duty

ball transfer units with ball Ø: 90 mm 

you will find every variant for your use!

https://www.rollenbau.at/en/produkte/produktart/Kugelrollen/kataloguebersichtrollenart/F39D9D