For many people, Precast Concrete Wall Fence Designs is an economical and attractive alternative to other types of fencing, but there are also a growing number of people who want to create custom concrete fencing. Concrete fences are generally made of reinforced concrete. Reinforced concrete is different from poured concrete, which is essentially just cement. Poured concrete can contain several thousands of tiny rocks and stones which have been individually added to give it the appearance of natural stone. The actual concrete wall is then fashioned out of this mold.