Decor and furniture
Sign Canvas Corrugated Metal 7x2
It's a sign. You write things on it.
Harvest drops
Iron× 10
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
When it collapses
Falling, it leaves 
Scrap Metal Pile (60% of the time) where it lands.
Where to find (5 POIs)
Favales Academy (tier 4), COC Chemicals (tier 3), The Boobie Trap (tier 3), Am-I-Gone Funeral Home (tier 1), Ivant Business Park.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.