The square split grinding rail is perfect for doing all kinds of skateboard, BMX bike, extreme scooter, snowboard or inline skate tricks. This is a PRO quality rail made with high strength steel, 360 degree welding at all joints and is powder coated for all weather durability. It assembles quickly and easily without any tools or accessory parts. Each end of the rail has four independent adjustment levels, allowing for a height variation of 10.5 to 15.5 inches. This allows for the rail surface to be slanted up or down or remain flat, at varied heights, for different tricks. There are two rubber pads on each of the feet to help prevent the rail from slipping. This rail comes apart in the middle for easy storage and transport.