4″/5″/6″/8″ Industrial Casters, Steel Cast Iron Wheel , Heavy Duty Caster
wheels made from a blend of steel (flexibility) and cast iron (strength)Wheel Diameter Ranges: 4″/5″/6″/8″, Wheel Tread Width: 2″Axle Bore ：1/2″, Hub Length: 2-7/16″, Bearing Size: ¾”Roller BearingTemperature range: -40° F to +500° FWeight capacity ranges : 4″wheel: 800 lbs. 5″wheel: 1000 lbs. 6″wheel: 1250lbs. 8″wheel: 1300lbs.