Shepherd Hardware 3-Inch Swivel Plate Cast Iron Caster, 250-lb Load CapacityThe Shepherd Hardware Series 1400 6 inch heavy duty phenolic wheels have a high strength, high impact and are resistant to oils, gasoline and dilute acids. Works best on carpet and concrete floor surfaces. 6 inch diameter black phenolic wheel with rigid plate mount The product is manufactured in China 840 lb load capacity High impact solid phenolic wheel for smooth operation under large loads A great choice for industrial and warehouse applications