Steel fence post, driven into the ground with a pneumatic post pounder or fence driver, are generally designated based on the weight in pounds per lineal foot and are commonly painted with a red tip on top.
A post pounder, post driver, post rammer, post knocker or fence driver is a tool used for driving fence posts and similar items into land surfaces. They are commonly painted with a white tip on top; white improves the visibility of the fence line. 
