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 wooden 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 to surrounding terrain during opening and closing cycles, effectively preventing gates from sagging and maintaining a level fence line. Heavy-duty gate caster: Heavy-gauge matte black plated steel plate and dual ball bearings provide strong load support, with a maximum load capacity of 200 lbs per gate wheel, making it easy to open or close large, heavy wooden gates, vinyl gates, metal tube gates, or metal swing gates. 360 swivel caster: 4-inch aging-resistant rubber caster with a 360-degree rotatable top plate, offering excellent mechanical strength and load capacity, allowing smooth directional movement with minimal effort. Easy to install: Heavy-duty universal mounting plate with 3 holes for easy attachment to wooden gates using lag bolts. The versatile hole pattern also allows for straightforward mounting to tubular farm gates, horizontal or vertical gate tracks, with mounting bolts and screws included.