Built-in Spring Design: Innovative spring built-in design extends spring service life while providing a more attractive appearance. The built-in spring-loaded clamp acts as a shock absorber when gate wheels for wooden gates roll over uneven or rough surfaces, reducing stress on the gate hardware and extending the life of gate posts and hinges. Spring-loaded Gate Caster: Adjustable spring bracket with up to 1-3/4 inches of spring-loaded vertical travel, automatically adjusting gate height to match surrounding terrain during opening and closing cycles. Effectively helps prevent gates from sagging and keeps the fence line level. Strong load-bearing support with a maximum load capacity of 220 pounds per gate caster, making it easy to open or close large, heavy gates. Heavy Duty Gate Wheel: Thick matte black powder-coated steel plate with double ball bearings provides strong load-bearing support. Each gate wheel has a maximum load capacity of 220 pounds and includes a side brake, making it easy to operate large, heavy wooden gates, vinyl gates, metal tube gates, or metal swing gates. 360-Degree Swivel Fence Gate Wheel: 4-inch aging-resistant rubber caster with a 360-degree rotating top plate offers excellent mechanical strength and load capacity. Easily moves in any direction, allowing safe and smooth gate operation with minimal effort.