Blocks
Gravel
Clause 804
A much bigger block with a cavity/hole going through the center.
Quarry Products
Drainage stone-small smooth rounded stone
Regular 4" block with a 30 degree offset.
Chips
3/8" Chips. Very small stones
The bigger thicker blocks up from the 4"
Plastering sand
2" clean medium sized stone
Regular sized blocks used for most building jobs.