Even if you think you may remain in your present location, why not have the flexibility to adapt to evolving opportunities? NELCO Concrete Blocks are designed to offer maximum modularity and versatility. High-Density Concrete Block is available in five standard densities to ensure shielding integrity for new construction or upgrades. MegaShield™ Modular Block is specially molded for superior interlocking strength and is pre-cast in several densities. The team at NELCO can easily help you determine the optimal block and density for your facility.