Metal Pillar

The Metal Pillar is the third unlockable pillar. A pillar is a stackable form of a foundation, which is used for building structures. You can stack up to 11 pillars in ARK: Survival Evolved Mobile.

Construction
The Metal Pillar can be placed on even or slightly uneven ground, or on the top or bottom of foundations, ceilings, or other pillars. Once the first Metal Pillar is placed, subsequent pillars can snap into place on the top or bottom of the first one, provided there is adequate room to do so.

A pillar or series of pillars with the bottom touching the ground and a ceiling on top will function as a foundation, providing support and allowing structures to be built on top of it.