Chips
3/8" Chips. Very small stones
Bags
An empty small bag.
Blocks
A much bigger block with a cavity/hole going through the center.
Gravel
Clause 804
Regular 4" block with a 90 degree offset.
Quarry Products
Plastering sand
2" clean medium sized stone
Small empty heavy duty sand bag.
4" clean large stone
Drainage stone-small smooth rounded stone