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Superlift Round U-Bolts are manufactured from low alloy, high strength steel. They come with a National Fine Class 2A Thread type. These U-Bolts also come in either anti-corrosion zinc or black e-coat finish. Superlift Round U-Botls are sold here in 4-pack paired with aircraft type Nylon inserted locking nuts and phosphate coated, heat treated extra thick washers.