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
4" clean large stone
Blocks
Bags
Small empty heavy duty sand bag.
An empty small bag.
Gravel
Aggregate mix
Concrete block that weighs one tonne.
An empty big bag.
A tonne bag of sand.
Regular 4" block with a 90 degree offset.