Furnished content.
(from Lumberjocks.com)
This fence can be used three different ways to provide three different fence heights. The first photo shows the 3/4 inch height on the right edge. In the second photo, I merely flipped it end-for-end so the T is in the back, and now the medium height is available on the right edge. In the third photo you see the tallest setting where I unscrewed the fence from the T, and rotated it to the tall side and screwed it into another set of holes on the T. To lock the fence in place, I use squeeze clamps with one on each end.