Built-in Spring Design: Innovative spring 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 roll over uneven or rough surfaces, reducing stress on 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 vertical travel, automatically adjusting gate height to match surrounding terrain during opening and closing cycles. Helps prevent gate sagging and keeps the fence line level. Strong load-bearing support with a maximum load capacity of 220 lbs per 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 supports up to 220 lbs and includes a side brake, making it ideal for large, heavy wooden gates, vinyl gates, metal tube gates, or metal swing gates. 360-Degree Swivel Fence Gate Wheel: 4-inch UV-resistant rubber caster with a 360-degree rotating top plate. Offers excellent mechanical strength and load capacity, allowing smooth movement in any direction with minimal effort.