Stacking the blocks can create stable walls and building structures that can be moved around as needed. Stacking the blocks can create stable walls and building structures that can be moved around as needed. A stack of lego blocks can be used to make stable walls and building structures that are easily moved around. Concrete lego blocks are made by pouring concrete into steel moulds. Clutch power is created by the interlocking system of male and female studs. Interlocking concrete blocks are a flexible solution for temporary or permanent applications that may be subject to changes or relocations due to clutch power (grip between interlocking elements). The 'grip' between the blocks provides immense stability and endless possibilities for combining blocks. It is easy to modify a construction of concrete lego-like blocks when necessary. keywords: limestone suppliers ,quarter down limestone,crushed limestone