3 7/8 in, Wheel Width 1 5/8 in, Wheel/Tread Material Polyurethane, Wheel Core Material Aluminum, Non-Marking Yes, Number of Wheels 1, Caster Brake Type No Brake Included, Tread Shape Standard Rigid, Standard Plate Caster, Load Rating 660 lb, Swivel Lock Type No Lock Included, Wheel Dia.