Heat-Resistant Steel Tread Wheel 7 000 lb Load Rating 6 000 lb and Greater Load Rating Range 12 in Wheel Dia 4 in Wheel Width Steel Wheel/Tread Material Extra Hard 179 BHN Precision Ball Standard Tread Shape 1 1/4 in For Axle Size Included Includes Spanner Bushing Forged Steel Wheel Core Material No Non-Marking 4 1/2 in Hub Length