The Quantum Storage Systems WR-00H Thermoplastic Resin Casters are a set of four swivel casters, with two featuring brakes, designed for various mobility and transportation applications. Each caster can carry up to 300 lbs., making them suitable for handling heavy loads and adding mobility to shelving units. They provide a practical solution for moving and reconfiguring shelving systems to adapt to changing storage needs. The casters' heavy-duty construction ensures durability and reliability in industrial and commercial environments.