Powerful Load Capacity: The heavy-duty cold-rolled steel bracket brings huge load capacity to your project, and a single wheel can carry a maximum load of 300KG / 661lbs.V-shaped Wheel: made of cold-rolled steel plate galvanized steel, with waterproof and anti-corrosion functions, good toughness, good wear resistance and chemical stability, can be used for a long time.Practicality: V-shaped groove design, unlike other pulleys, V-shaped groove can perfectly adapt to the inverted track, and can reduce vibration, suitable for round pipe production track.Dual Bearing Characteristics: There are two rolling bearings built into the grooved wheel, which have good sliding characteristics, provide greater flexibility and make better use of the available floor space.Widely Used: reverse rails, yard gates, rolling shutters, patio sliding doors, industrial machinery, wire rope guides, container shelves, baby doors, dog doors, etc.