Blocks
The bigger thicker blocks up from the 4"
Bags
An empty big bag.
Regular 4" block with a 90 degree offset.
Gravel
Clause 804
Aggregate mix
Screenings-Very dusty gravel
Concrete block that weighs one tonne.
Chips
A much bigger block with a cavity/hole going through the center.
Regular sized blocks used for most building jobs.