Concrete Masonry Unit (NEXT picture shows close up)!!

Concrete Masonry Units, also known as CMU are used for structual support such as foundation work, retaining walls, building walls, etc. They can also be used for aesthetics (appearance).TYPICAL dimensions of CMU are 8x8x16, 8x12x16, and 4x8x16.A concrete masonry unit, concrete block, cement block or foundation block is a large rectangular brick used in construction.Concrete blocks may be produced with hollow centres to reduce weight or improve insulation. The use of blockwork allows structures to be built in the traditional masonry style with layers (or courses) of overlapping blocks.