The Diamond Pier® footing is a foundation system that uses a concrete head with piers inserted diagonally through it to create a footing to support decks, porches, walkways, and other structures.
Only the top portion of the pier head will be visible, most of the head and all of the pins will be submerged underground.
Diagram as used with a deck project (below)
Diamond Piers can be inspected at the same time as the rest of the project, because a tape measure can be inserted into each hollow pin to ensure the pin was inserted to the approved depth.