Sign Decal Corrugated Metal 4x1
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 (24 POIs)
Champions Coliseum (tier 5), Ostrich Hotel (tier 5), Holvez Rent-a-Car (tier 4), Shotgun Messiah Range (tier 4), Pass-N-Gas Plaza (tier 3), Pass-N-Gas Truck Plaza (tier 3), Collision Center (tier 2), Elite Essentials (tier 2), Joey's Carlot (tier 2), My Spot Parking (tier 2), ZMB Radio Station (tier 2), Buy-N-Go Rest Stop (tier 1), Bean Counter Court, Busted Industrial Tank, Civic Square, Clunky Oil, Fortified Fizz Cola Warehouse, HNN Bank Ruins, Industrial Tank #1, Industrial Tank #2, Leaking Industrial Tank, Navezgane Outlets, Urban Style Shops, Zillion Tower.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.