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.
The bigger thicker blocks up from the 4"
Quarry Products
2" clean medium sized stone
Plastering sand
Bags
Small empty heavy duty sand bag.
Gravel
Screenings-Very dusty gravel
An empty big bag.
Regular 4" block with a 90 degree offset.