Head low up, height adjustment maneuvered by screw system. Provided with thrust ball bearing. Both screws easily wind able by independent handle. Top, mainframe, base, links, leg end made frame 1.22mm (18 SWG) SS or MS pipes and sheets, which it makes rigid & sturdy Medical Equipment. MS material pre- treated in seven-tank chemical process & epoxy powder coated, which it makes uncorrosive Medical Furniture Hospital Equipment.