VEVOR Heavy Duty Leveling Casters, Leveling Casters Stem, Set of 4, 2, Retractable Leveling Casters for Workbench, 2200lbs Max Loading Capacity, 360-
39'',Bolt Length: 35 mm/1.2'',Hardness of Tread: 70 Shore D,Center Bolt: M12,Load Capacity of One Caster: 250 kg/550 lbs,Model: GD-60S,Load Capacity of Four Casters: 500 kg/1100 lbs,Material: Carbon Steel, TPE, Aluminum, Nylon,Wheel Diameter: 50 mm/1.