Element 6' Flatbar Grind Rail [Prismatic Red] Element 6' Flatbar Grind Rail in Prismatic Red. The element flatbars feature an extra wide 4" bar that makes for flatbars that you can easily grind. Other features include: welded end caps for a more solid feel, three adjustable height settings and rubber bottom pads to keep the flatbar firmly in place while you skate. Three adjustable heights 10 1/4" 1/4" 12", 13 1/2"