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
Regular 4" block with a 90 degree offset.
Bags
Small empty heavy duty sand bag.
Quarry Products
2" clean medium sized stone
Chips
Drainage stone-small smooth rounded stone
Gravel
Clause 804
4" clean large stone
Aggregate mix
A tonne bag of sand.