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
Concrete block that weighs one tonne.
Quarry Products
4" clean large stone
The bigger thicker blocks up from the 4"
Bags
An empty small bag.
Small empty heavy duty sand bag.
Regular 4" block with a 90 degree offset.
Gravel
Aggregate mix
Drainage stone-small smooth rounded stone
Clause 804
An empty big bag.