Grizzly 58100 4-Inch Heavy-Duty Fixed Caster

Rugged heavy-duty wheels with an injection molded polyurethane elastomer tire surface. polyurethane is hard wearing handles high loads and will not mark the floor. caster mounting pad has slotted holes with a 3-Inch x 3 1/2-Inch rectangular hold pattern. wheels have roller bearings which can be re-greased using the grease fitting. wheels are all 2-Inch wide.