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.
Blocks
Concrete block that weighs one tonne.
Regular sized blocks used for most building jobs.
Quarry Products
Plastering sand
2" clean medium sized stone
Gravel
Screenings-Very dusty gravel
Regular 4" block with a 30 degree offset.
Chips
Drainage stone-small smooth rounded stone
A tonne bag of sand.