The Quantum Storage Systems WR-00CO Conductive Stem Casters are designed to protect electronic components by resisting electrostatic build-up and electromagnetic interference. The set includes four swivel casters, two of which have brakes for added stability. Each caster can handle loads of up to 300lbs, making them suitable for heavy-duty applications. When attached to the unit, the conductive casters keep it grounded, ensuring ESD safety for stored electronic components.