【Ultra Heavy Duty Casters】This extra heavy duty casters with solid red polyurethane wheels, ideal for clean room environments that are often exposed to large amounts of water. Solid polyurethane wheels withstand temperatures from -40° F to +180° F. If you have wash down applications, humidity, water, chemicals, steam cleaning or any application involving moisture, these casters are for you. 【Caster Size】Industrial caster diameter: 4 inches, width: 2 inches. Plate size: Top plate 4"x4-1/2", mounting over heights 5-1/2", One caster wheel Load capacity is 1500lb, set of 4 load Capacity will be 6000lb.It is almost the largest load-bearing 2-inch wide wheels and can do most of the work on wheels. 【Industrial Grade Casters】The caster top bracket is made of bright galvanized steel, which can withstand strong vertical impact forces. Precision ball bearings are quieter, more load-bearing and have a longer service life than other conventional bearings. This ensures that the casters run smoothly and quietly for a long time and are not easily damaged. 【Adaptable to Various Uses】These casters are adaptable to different environments and conditions, resistant to most chemicals, oils, acids, greases and water, providing reliable performance even in extreme industrial environm 【Widely Used】Our casters in this series are suitable for extreme heavy-duty use, with load capacities up to 10,000 lbs. Ideal for manufacturing plants, traction lines, and where tight push/pull forces are required, such as large industrial equipment, institutional machinery, large flatbed carts, material handling equipment, laboratory equipment, hospital equipment office equipment, mobile carts, and utility and maintenance carts. Kingpinless Plate Casters