Helpers
Floatation Pillar 1m
This block will provide full support no matter where it is placed, just like it was placed on bedrock.
Harvest drops
Iron× 17
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Scrap Metal Pile (75% of the time) where it lands.