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Features:V-shaped wheel can perfectly adapt to the inverted track, and may lower vibration, suitable for V-shaped groove trackSpecification:Material: SteelBase plate diameter:1.2 Inch-- 56mm*30mmA single load-bearing capacity:1.2 inch--200kg (440 pounds)Package Contents:4pc Wheel Note:1. The real colour of the article may be barely diversified from the images proven on online page attributable to many factors such as brightness of your video display and light-weight brightness.2. Please allow slight guide dimension deviation for the data.