Polyurethane Tread on Steel Core Wheel 1 100 lb Load Rating 1 000 to 2 999 lb Load Rating Range 3 1/8 in Wheel Dia 1/4 in Wheel Width Polyurethane Wheel/Tread Material Firm 92 Shore A Precision Ball Standard Tread Shape 1/4 in For Axle Size Not Included Includes Spanner Bushing Steel Wheel Core Material Yes Non-Marking 5/16 in Hub Length