GSW 5" Plate Caster Set of 4, Industrial Casters with Capacity 1480 LBs, Heavy Duty Casters - Use for Inventory Carts, Workbench, Platform Cart (Swivel with Brake) Equipment Powerful Unheated Air Fan -

Powerful Unheated Air Fan - it does not generate cold or hot air

Also no annoying “beep” sound while pressing on the buttons

just attach them to the middle-top of the door and door frame close together

Square Stem outer with socket: 7/8"

GSW 5" Plate Caster Set of 4, Industrial Casters with Capacity 1480 LBs, Heavy Duty Casters - Use for Inventory Carts, Workbench, Platform Cart (Swivel with Brake) Equipment Powerful Unheated Air Fan -Heavy Duty Casters: GSW's heavy duty casters are crafted from high quality polyurethane with bright galvanized steel wheels and yokes. The caster wheels feature highly compressed sintered iron, ensuring exceptional abrasion resistance, rust resistance, and robust shock absorption and buffering capabilities. This design significantly enhances the overall service life of the casters. CASTER DETAILS: The industrial casters boast a total height of 6".