These bearing are relubricatable with spherical outside diameters and shroud seals
The metal shroud maintains tight seal contact against the inner ring and shields the rubber seals from damage because of dirt or fiber wrap
The concentric collar is locked to the shaft by two set screws located 120 degrees apart, mated with threaded holes in the collar and drilled holes in the bearing inner ring
The extra-wide design provides additional shaft support and extra large grease capacity