Heat-Resistant Iron Tread Wheel 800 lb Load Rating 300 to 999 lb Load Rating Range 4 in Wheel Dia 2 in Wheel Width Iron Wheel/Tread Material Extra Hard 188 BHN Precision Ball Standard Tread Shape 1/2 in For Axle Size Included Includes Spanner Bushing Iron Wheel Core Material No Non-Marking 2 1/4 in Hub Length