Simply the lowest horizontal (cross) rail on any fence panel or gate. Bottom rails are said to be standard when the vertical pickets go through. Bottom rails are said to be flush, like our Style 9, when this rail is at the very bottom of any panel or gate. Style 3 panels / gates can be configured with a flush bottom rail; and this is typically done for swimming pool fence enclosures. See: Pool Fence
There are basically 2 types of bottom rails: Standard and Flush. Styles 1, 2, 3, 4, 5, 6, 7 and 8 can be ordered with the bottom rail flush at no additional cost. Style 4 and Style 9 are basically the same styles — Style 4 having a standard bottom rail and Style 9 having a flush bottom rail.