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
Quarry Products
Drainage stone-small smooth rounded stone
Gravel
Clause 804
Concrete block that weighs one tonne.
Regular 4" block with a 30 degree offset.
Bags
Small empty heavy duty sand bag.
Regular sized blocks used for most building jobs.
2" clean medium sized stone
Plastering sand
Chips
3/8" Chips. Very small stones