A much bigger block with a cavity/hole going through the center.
They are a much bigger block than the 4″ and 6″ blocks with a cavity/hole going through the center of the block. Sold in bales of 20 or by single blocks on their own.
Blocks
Quarry Products
2" clean medium sized stone
Chips
Regular 4" block with a 90 degree offset.
Plastering sand
The bigger thicker blocks up from the 4"
4" clean large stone
A tonne bag of sand.
Drainage stone-small smooth rounded stone
Gravel
Aggregate mix