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.
Quarry Products
Drainage stone-small smooth rounded stone
Bags
An empty small bag.
Plastering sand
Small empty heavy duty sand bag.
An empty big bag.
Blocks
4" clean large stone
Regular 4" block with a 90 degree offset.
A tonne bag of sand.