Hi, I'm Mark Sullivan for Expert Village. Today we will show you how to build a privacy fence around your yard. The concrete that you would be setting your 4x4 post in is similar to this. It is called ready mixed concrete. All you have to do is dump this bag into your wheel barrel and then mix it with water. Then with a hole or a shovel, then you dump it in to the hole and then that is what you set your concrete into. They make these in 60 and 80 pound bags. I think this is about 80, feels like. Ya 80 pounds it is pretty cheap, a couple of dollars a bag. There is the concrete mix that you would be using to set your post in.