CCTVMTST 4Pcs 8mm Bore Diameter Pillow Block Ball Insert Bearing Rail Mounted

The description says these have bearings that are self adjusting and easy to adjust or replace. Mine are not. The center bearing is locked and does not pivot. I put in a ten inch long shaft and pulled as hard as I dared trying to pivot the bearing in the housing but it didn’t budge. Seem the work Ok if you don’t need/want the adjustable feature. Also, the pictures suggests these come with a hex key. Mine did not.

Never thought press-fitting bearings into a pillow block was so difficult for manufacturers to do, but in this case, they couldn't get this right. Pure garbage.

For what I have received, 3 out of 4 bearings were not manufactured well. They are not 90 degree perpendicular to the base. However, it is possible to press them to correct direction. Also, I tried to take bearing out of the base but failed; it's NOT easy to "adjust or replace the bearing".