【Premium Quality】:3" Heavy Duty Cast Iron Caster with a Swivel Top Plate with Top Lock Brake system with a Cast Iron Polyurethane Non-Marking Green casters.The protective casters is liquid cast and chemically bonded onto heavy-duty iron casters centers. The distinctive green 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: 3", Width: 2", Top Plate: 4x 4-1/2, Overall Height: 4-1/2. These industrial casters are engineered, Heavy Duty Caster Set of 4 to support loads up to 2800 lbs, making them ideal for outdoor use and transporting heavy equipment and objects while maintaining stability. 【Roller Bearing】The caster casters adopts Roller Bearing, which increases the load capacity and durability, making the caster casters 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. 【Multiple Use Applications Include】 : Bakery & Food Service Equipment, Institutional Machinery, Hospitality Carts, Hospital Equipment, Laboratory Equipment, Material Handling Equipment,Office Fixtures, Moving Dollies and Utility and Maintenance Carts. 【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