Features:V-shaped wheel can completely adapt to the inverted track, and may minimize vibration, appropriate for V-shaped groove trackSpecification:Material: SteelBase plate diameter:1.2 Inch-- 56mm*30mmA unmarried load-bearing capacity:1.2 inch--200kg (440 pounds)Package Contents:4pc Wheel Note:1. The genuine shade of the object could also be slightly assorted from the photographs proven on web content caused by many factors reminiscent of brightness of your monitor and light-weight brightness.2. Please enable slight guide dimension deviation for the data.