https://www.jpcorry.com/jp-corry-products/ag-wall-diamond-30-block-basalt/
AG Wall Diamond 30 Block Basalt
Description
Diamond AG 30 walls can be used to create attractive retaining walls up to 1.2m (4ft) high and are built without mortar or concrete. Each block features a patented rear lip that acts as a guide to ensure accurate alignment and precise set back every time which means fast installation whatever the weather