A quick learner from Maine says:
There are no numbers or markings on the wheel. It is for a mirror closet door.
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Casey from SWISCO responded:


Take a look at the three closet rollers we've related for you and see how the dimensions compare. If none of them appear to be a perfect match, please provide us with your dimensions and we will see if a better replacement option is available. Thank you!

23-198 : Sliding Mirror Door Roller, 1-1/2
Sliding Mirror Door Roller, 1-1/2" dia.
23-092 : Mirror Door Roller Assembly, 1-1/8
Mirror Door Roller Assembly, 1-1/8"
Sliding closet mirror door rollers and tracks
Sliding closet mirror door rollers and tracks
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