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
The bigger thicker blocks up from the 4"
Chips
Quarry Products
Drainage stone-small smooth rounded stone
Plastering sand
Gravel
Screenings-Very dusty gravel
Clause 804
4" clean large stone
Aggregate mix
Regular 4" block with a 90 degree offset.