• 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 Bearing
• Temperature range: -40° F to +500° F
• Weight capacity ranges : 4"wheel: 800 lbs. 5"wheel: 1000 lbs. 6"wheel: 1250lbs. 8"wheel: 1300lbs.