Blocks
Bags
An empty big bag.
Small empty heavy duty sand bag.
The bigger thicker blocks up from the 4"
A much bigger block with a cavity/hole going through the center.
Quarry Products
Drainage stone-small smooth rounded stone
2" clean medium sized stone
Plastering sand
Concrete block that weighs one tonne.
Gravel
Clause 804
Regular 4" block with a 90 degree offset.