A much bigger block with a cavity/hole going through the center.
They are a much bigger block than the 4″ and 6″ blocks with a cavity/hole going through the center of the block. Sold in bales of 20 or by single blocks on their own.
Gravel
Clause 804
Blocks
Regular sized blocks used for most building jobs.
Aggregate mix
Chips
Screenings-Very dusty gravel
Concrete block that weighs one tonne.
Quarry Products
A tonne bag of sand.
Regular 4" block with a 30 degree offset.