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.
Quarry Products
A tonne bag of sand.
Bags
An empty big bag.
Gravel
Aggregate mix
Screenings-Very dusty gravel
Regular sized blocks used for most building jobs.
Drainage stone-small smooth rounded stone
Clause 804
Chips
3/8" Chips. Very small stones