Polyurethane Tread on Iron Core Wheel 3 525 lb Load Rating 3 000 to 5 999 lb Load Rating Range 7 7/8 in Wheel Dia 3 1/8 in Wheel Width Polyurethane Wheel/Tread Material Firm 92 Shore A Precision Ball Standard Tread Shape 1 in For Axle Size Not Included Includes Spanner Bushing Iron Wheel Core Material Yes Non-Marking 3 17/32 in Hub Length