Keystone Compac® III Straight/Hard Split retaining wall units are lighter weight with a shorter tail design which make them easy to handle. Trusted by architects, engineers and contractors around the world, the Keystone Compac III unit utilizes the proven Keystone pin connection system. This system improves performance with geosynthetic textiles and features 6,400 psi shear strength. These units are made by order and not stocked on a regular basis. Corners and caps (shown above) can be used to top off your Compac III project.