Integrated spring design: Innovative integrated spring design extends the life of the spring while providing a more attractive appearance. Built-in spring 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 roller: Adjustable spring-loaded support with up to 4.5 cm of vertical travel, allowing automatic gate height adjustment relative to surrounding terrain during opening and closing cycles, effectively preventing gates from sagging and maintaining a level fence line. Heavy-duty gate caster: Constructed with heavy-gauge matte black plated steel plate and dual ball bearings for strong load support. Each gate wheel supports up to 200 lbs, making it easy to open or close large, heavy wooden gates, vinyl gates, metal tube gates, or metal swing gates. 360-degree swivel caster: 4-inch aging-resistant rubber wheel with a fully rotatable top plate, offering excellent mechanical strength and load capacity. Easily turns in any direction, requiring minimal effort to operate the gate safely. Easy to install: Heavy-duty universal mounting plate with 3 holes for secure attachment to wooden gates using lag bolts. The versatile hole pattern allows for simple mounting to tubular farm gates along horizontal or vertical gate tracks. Mounting hardware included.