[SPRING DESIGN]: This gate caster adopts advanced spring-loaded design, which can automatically adjust the height on uneven ground, prevent the gate from sagging, and can open and close the gate freely. And be sure to maintain contact with the floor when opening and closing the door easily, reducing noise! [HEAVY DUTY CASTERS]: The gate spring caster is 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. These are the ideal gate wheels for wooden and mental gates. [GOOD SHOCK ABSORPTION]: The design of PU wheel and spring clamp promote smooth operation 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 shock absorption 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's the perfect heavy duty gate wheel for your everyday life. [WIDE APPLICATION]: This heavy duty gate wheel can be applied to wooden garden gates, front gates and yard fences, revolving gates, sliding gates, storage racks, carts, flight cases, carts, tool boxes, speakers, cabinets, amplifiers, equipment racks, various furniture, etc., it can bring great convenience to your life.