Rigid, Corrosion-Resistant Kingpinless Plate Caster, Load Rating 600 lb, Swivel Lock Type No Lock Included, Wheel Dia. 4 in, Wheel Width 2 in, Wheel/Tread Material Polyurethane, Wheel Core Material Plastic, Non-Marking Yes, Number of Wheels 1, Caster Brake Type No Brake Included, Tread Shape Standard