This is a 4-pack of rubber casters with a load capacity of 1440 pounds. The set includes 2 swivel casters with brakes and 2 rigid casters, and they are top plate mounted. The casters are designed to run quietly and smoothly on various surfaces and are easy to install. They can be widely used in trolleys, tool boxes, cabinets, furniture, workbenches, and benches. The casters have a 360-degree rotation feature for effortless movement in any direction.