These heavy duty casters are perfect for a variety of applications, including industrial, commercial, and office use. They feature a foghorn construction, which makes them durable and long-lasting, even in tough environments. The casters have a capacity of 3500 lbs, making them suitable for heavy loads. They also have a poly tread, fully-sealed bearings, and zinc-treated cast iron, which makes them resistant to corrosion and wear. The casters are easy to install and require no tools. They are also swivel, making them easy to move around. Overall, these casters are a great choice for anyone who needs a reliable and durable set of casters for their heavy loads.