The Plate Casters come in a pack of 4 and have a load capacity of 1000 pounds per caster, providing a total capacity of 4000 pounds. The polyurethane wheels are molded on steel for durability and are 5 inches in diameter with a 2-inch width. The top plate is extra wide with dimensions of 4"x4-1/2" and a mounting over height of 6-1/2". The casters are red in color and include 2 swivel and 2 rigid casters, with the swivel casters having the ability to rotate 360 degrees. The roller bearing has a hardened raceway for extra strength, making these casters a reliable choice for heavy-duty applications.