The Medium Heavy-Duty Casters are the backbone of Material Handling Industry. Nearly every warehouse, freight terminal, manufacturing plant and industrial business use these types of casters in their operations. They are ideal for platform trucks, material handling carts, vending machines, warehouse and factory applications, heavy-duty food service and institutional equipment, tool boxes, stock carts, shelf trucks, ground support equipment, bakery carts, a-frame trucks, assembly line dollies, maintenance carts, mobile storage racks and countless other medium duty applications. All swivel sections are equipped with a lubrication fitting for field maintenance. RWM lubricates all swivel sections prior to shipment. Notched yokes are standard. In addition, The wheels of this series has a wide variety of 3-1/4" through 8" diameters available with either roller, ball bearing, celcon or plain bearings.