An empty small bag.
An empty small bag which can be filled with 4 stone weight of sand, gravel or chips. Bought on its own as an empty bag.
Blocks
A much bigger block with a cavity/hole going through the center.
Regular sized blocks used for most building jobs.
Chips
3/8" Chips. Very small stones
Quarry Products
4" clean large stone
Gravel
Aggregate mix
A tonne bag of sand.
Screenings-Very dusty gravel
Drainage stone-small smooth rounded stone
Clause 804