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
Drainage stone-small smooth rounded stone
Concrete block that weighs one tonne.
Chips
Gravel
Screenings-Very dusty gravel
Regular sized blocks used for most building jobs.
Plastering sand
Regular 4" block with a 30 degree offset.
Clause 804
4" clean large stone