Blocks
Regular 4" block with a 90 degree offset.
Concrete block that weighs one tonne.
Chips
3/8" Chips. Very small stones
Bags
An empty big bag.
Regular 4" block with a 30 degree offset.
Small empty heavy duty sand bag.
Gravel
Clause 804
Quarry Products
2" clean medium sized stone
4" clean large stone
Aggregate mix