Do you want to make your equipment to achieve horizontal adjustment and flexible movement?It is a great choice to choose our leveling casters which combine the functions of height adjustment, fixed heavy load, rolling movement, dustproof and cleanliness protection. It is widely used in office furniture, machinery industry, medical equipment and so on Each package is included 4 leveling casters: Nuts×17; Screws×17; Flat Washers×17; Spring Washers×17