This is a unique wall unit that is primarily used as a Segmental Retaining Wall (SRW) Unit. It is a unit that is designed to create rugged looking natural stone walls up to 30 feet in height – engineered wall systems. However, because of its strength and durability, it is often used for steps, terraces and small free-standing walls of 3 feet or less. The hollow cores and interlocking mechanism that exists make it easier to install than most other retaining wall systems.