2 Rigid, 2 Swivel, Standard Plate Caster Kit, Load Rating 3200 lb, Swivel Lock Type No Lock Included, Wheel Dia. 4 in, Wheel Width 1 1/2 in, Wheel/Tread Material Polyurethane, Wheel Core Material Polyurethane, Non-Marking Yes, Number of Wheels 1, Caster Brake Type No Brake Included, Tread Shape Standard, Package Quantity 4