... H4 Heavy duty type double ball bearing swivel caster wheel Heavy Duty Caster /Four Size available (4'',5'',6'', ... Electrophoresis finishing available .6.Caster wheel can be changed to Pvc,rubber ,nylon ,pp ,tpr ,cast iron,high-heat ... resistant material ,conductive wheel7.Applications: supermarket, display racks, handcart, transport vehicle ,general usage in market or industrial ...