【Premium Quality】:4" heavy duty cast iron caster with a swivel top plate with a cast iron polyurethane non-marking red wheel.The protective wheel is liquid cast and chemically bonded onto heavy-duty iron wheel centers. The distinctive red treads are chemically inert, non-sparking, non-conductive, impervious to ozone, grease and most oils & solvents, and will not mark floors. 【Heavy Duty Capacity】: Heavy Duty Casters Diameter: 4", Width: 2", Top Plate: 4x 4-1/2, Overall Height: 5-5/8. These industrial casters are engineered, Heavy Duty Caster Set of 4 to support loads up to 3200 lbs, making them ideal for outdoor use and transporting heavy equipment and objects while maintaining stability. 【Roller Bearing】The caster wheel adopts Roller Bearing, which increases the load capacity and durability, making the caster wheel with low friction resistance, high speed limit, and easier to move. Coupled with the 360-degree swivel top plate, you can easily change any direction you want with a little effort. 【WIDE APPLICATIONS】 Use our casters with the workbench to move the workbench with very little effort. Outdoor casters are available for both industrial and residential applications. Such as wood storage racks, furniture, wheelbarrows, workbenches, rolling work boxes, cabinets, tool boxes, gate fence wheels. Suitable for various scenarios like industrial, warehouse, hotel, institution, food service, food processing and retail display etc. 【WE CARE FOR YOU】：Heavy duty casters come with friendly customer service. If you have any questions, you can contact us for a solution, we will definitely provide you with a satisfactory solution. Heavy Duty Caster