Iron-core pu caster6*2 inch 1,swivel top plate ,pu&iron wheel 2,plate Zinc or spray plastics 3,steel ... thickness 5.5mm or 6mm Iron core pu caster 6*2 ... inch 1,swivel top plate ,pu&iron wheel2,plate Zinc or ... :1) Heavy duty industrial caster with cast iron molded PU wheel2) Swivel, rigid, swivel with brake3) Size: ...