4 in. Red TPU Heavy-Duty Swivel Plate Caster with Brake, 250 lbs. Weight CapacityHeavy Duty Polyurethane casters are perfect for heavy loads and for all types of surfaces from carpet to wood to concrete. They can handle rough surfaces better than most materials yet will still give a smooth ride. These casters are resistant to water, oil and chemicals so they can be used for commercial and residential applications. Brakes are used to lock wheels into place to prohibit movement. 4 in. Dia 250 lbs. capacity per caster Plate