Instructions for the production of quality concrete Lego bricks - Block Moulds
These Lego-like blocks let you build your own concrete walls - Block Moulds
Council barricades field with giant concrete 'Lego bricks' to stop travellers from setting up camp | Daily Mail Online
Concrete Allegro blocks - What are they and how much do they cost?
Think Defence on X: "Concrete Lego blocks. All along the border with Russia, NATO nations should have half a dozen pallets of these pre-positioned at every road junction, bridge and railway line