These massive one ton blocks literally hold up the earth. The shear mass and size of each block utilizes the power of gravity to create strong, beautiful walls. The Redi-Rock gravity system minimizes excavation and installation time and features multiple batter options to allow tall walls. The gravity system allows you to: build close to property lines, minimize excavation, locate utilities directly behind the wall, install directly in front of old walls and save existing landscaping — just to name a few of the benefits.