[SPRING DESIGN]: This gate roller adopts advanced spring design, which can automatically adjust the height on uneven ground, prevent the door from sagging, and can open and close the door freely. And be sure to maintain contact with the ground when opening and closing the door easily, reducing noise! [HEAVY DUTY CASTERS]: The gate spring caster is made from Made of high quality PU material and electroplated alloy, strong and durable. The caster wheel has a maximum load capacity of 60 kg and can withstand exposure to chemicals and solvents. It is the ideal gate wheels for wooden and mental gates. [GOOD SHOCK ABSORPTION]: The design of the PU wheel and the spring clamp promotes the smooth running of the caster when rolling on uneven or rough surfaces, reducing friction with the ground, making it easier to move and open or close the gate easily, with a shock-absorbing effect. [EASY INSTALLATION] : Sturdy universal mounting plate with 4 holes for easy attachment to wooden doors or along the horizontal or vertical guides of a tubular door, fits perfectly and works well. It is the perfect heavy duty gate wheel for your daily life. [WIDE APPLICATION]: This heavy duty gate wheel can be applied to wooden garden gates, front doors and fences yard doors, revolving doors, sliding doors, storage racks, carts, flight cases, carts, tool boxes, speakers, cabinets, amplifiers, equipment racks, miscellaneous furniture , etc., it can bring great convenience to your life.