... 5.5mm or 6mm Iron core pu caster 6*2 inch 1,swivel top plate ,pu&iron wheel2,plate Zinc or spray ... plastics3,steel thickness 5.5mm or 6mmFeatures:1) Heavy duty industrial caster with ... cast iron molded PU wheel2) Swivel, rigid, swivel with brake3) Size: ... 50,250*50,300*50mm 6 inch Iron-core pu caster