These 4" plate casters with polyurethane wheels are a heavy-duty and durable option for transporting items up to 700 pounds. The pack includes 2 swivel and 2 rigid casters, with the swivel casters capable of rotating 360 degrees. The wheels have a width of 2 inches and a diameter of 4 inches, and are mounted on a top plate with dimensions of 4"x4-1/2". The casters have a total capacity of 2800 pounds, which is four times the weight capacity of other casters on the market. The casters are designed with roller bearings and hardened raceways for extra strength. They come with a 90-day hassle-free return policy and a 100% satisfaction guarantee. The casters are colored in red.