Block dimensions:12″HIGH X 17″LONG X 4″THICK
Blocks
A much bigger block with a cavity/hole going through the center.
The bigger thicker blocks up from the 4"
Bags
An empty small bag.
Quarry Products
4" clean large stone
Regular sized blocks used for most building jobs.
Drainage stone-small smooth rounded stone
Gravel
Screenings-Very dusty gravel
Concrete block that weighs one tonne.
A tonne bag of sand.
Clause 804