... 100 Shore AHousing:Made of pressed steel,zinc plated,double ballrace swivel head,dustproof sealWheel:Materials: Hard rubber wheelBearing ... in the industry and easier turning due to the differential action of the wheels. Also design for business machines,displays, ... mobility requirements.Housing: Made of pressed steel,Zinc plated,double ballrace swivel head,Dustproof seal Wheel: Plastic wheel Mark ...