Integrated spring design: Innovative integrated spring 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 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 capacity of 200 lbs per wheel, making it easy to open or close large, heavy wooden, vinyl, metal tube, or metal swing gates. 360 swivel caster: 4-inch aging-resistant rubber wheel 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 secure attachment to wooden gates using lag bolts. The versatile hole pattern also allows for easy mounting to tubular farm gates along horizontal or vertical gate tracks. Mounting bolts and screws included.