Heavy Duty Industrial Post / Guide Roller. The roller is 4" dia. x 23" the overall height is around 30-1/2" I have a few of these 1 is slightly different and looks to be made by a different manufacture they are new except the one with the white sticker it may have had some light use or is just a new one that has sat around longer please look at all the pictures.

 
This is from a now closed book manufacturing Co. 
 
 
This is surplus to a now closed factory that kept spare parts on the shelf the boxes may show shelf wear and have some dust on them
 
 
[Please Look at all the pictures they are part of the description]
 
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