These highly versatile stackable concrete blocks can be connected using a Lego system and applied for a large number of functions that range from making barriers and retaining walls to constructing bankers. The Company supplies two different sizes (1600mm x 800mm and 800mm x 800mm). These blocks are positioned in place using a special block clamp which leaves very smooth surfaces. Stackable Concrete Blocks do not need to be reinforced and moulds are also available with a texture that resembles rubble walls.