Sign Decal Corrugated Metal 7x1
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 (25 POIs)
Ostrich Hotel (tier 5), Two Bit Tower (tier 5), Vanity Tower (tier 5), Coleman's Drive-In (tier 4), Downtown Marketplace (tier 4), ParKing Garage #2 (tier 4), Super Shamway (tier 4), 4 Ever Video (tier 3), HSP Distribution Center (tier 3), Pass-N-Gas Plaza (tier 3), Pass-N-Gas Truck Plaza (tier 3), Shady Woods Amphitheatre (tier 3), Collision Center (tier 2), Smarketing (tier 2), Am-I-Gone Funeral Home (tier 1), Century Outlet (tier 1), Moe's Grocery (tier 1), The Greasy Spoon (tier 1), Booze Vault, Carlos' Travel Center, Massive Gains Mall, Plating Company, Route 66 Restaurant Row, Tattered Outlet, Willtronics Corner.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.