Polyurethane Tread on Steel Core Wheel for Pallet Jacks 1 870 lb Load Rating 1 000 to 2 999 lb Load Rating Range 3 17/64 in Wheel Dia 4 1/2 in Wheel Width Polyurethane Wheel/Tread Material Firm 92 Shore A Precision Ball Standard Tread Shape 1 3/16 in For Axle Size Not Included Includes Spanner Bushing Steel Wheel Core Material Yes Non-Marking 1 5/8 in Hub Length