... cap.250-350kgs *wheel width at 50mm H4 Heavy duty type double ball bearing swivel caster wheel Heavy Duty Caster /Four ... pressed steel .4.Top plate swivel brake type ,fixed type ,threaded stem type,Bolt hole type are available for your selection.5.Zinc plating ... be changed to Pvc,rubber ,nylon ,pp ,tpr ,cast iron,high-heat resistant material ,conductive wheel7.Applications: supermarket, display racks ...