nVent Hoffman PS1CLKHD Other Networking Racks and CabinetsCaster/Leveler kits are available in either a light duty (900 lbs.) or heavy duty (3000 lbs.) load rating. The kits are comprised of a set of four caster/levelers and all assembly hardware. Each caster is easily assembled to the cabinet and swivels to allow ease of cabinet movement. The casters are made of black composite material. The levelers are easily adjusted down and secured with furnished locking nuts. These Caster/Leveler kits are designed for moving a cabinet within a facility to its final location.