Enhanced Durability: Our innovative integrated spring design extends the life of the spring while providing a more aesthetic appearance. The spring clamp acts as a shock absorber, reducing stress on gate hardware and extending the life of posts and hinges. Adaptable to Any Terrain: The adjustable spring bracket allows up to 1-3/4 vertical travel, automatically adjusting the gate height with the surrounding terrain during opening and closing cycles. This effectively prevents gates from sagging and keeps the fence line level. Strong and Durable: Our heavy duty gate wheels are designed with thick matte black finish plating steel plate and double ball bearings for strong load bearing. Each wheel can support a maximum load of 250 lbs, making it easy to open or close large, heavy wooden doors, vinyl doors or metal gates. 360° Mobility: The 5-inch aging-resistant rubber caster with a 360° rotating top plate provides excellent mechanical strength and load-bearing capacity. You can easily move the door in any direction with little force for safe movement. Easy Installation: The heavy-duty universal mounting plate has 3 holes for easy attachment to wooden doors using lag bolts. The versatile hole pattern also allows for simple mounting to a tubular farm door along a horizontal or vertical door track, with mounting bolts and screws included.