Thin Metal Railing Corner
Metal stairs and catwalks are essential for that industrial look.
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 (26 POIs)
Crack-a-Book HQ (tier 5), Pop-N-Pills Factory (tier 5), Don Vittorio Spagetto Residence (tier 4), Flushing Rule Palace (tier 4), Hybrid Energy (tier 4), Infested Warehouse (tier 4), Richard Munchz Plaza (tier 4), Wasted Stiff's (tier 4), COC Chemicals (tier 3), HSP Distribution Center (tier 3), Pass-N-Gas Refinery (tier 3), Pop-N-Pills (tier 3), Shamway Warehouse (tier 3), The Boobie Trap (tier 3), Working Stiff Tools Warehouse (tier 3), BONG Auto Parts Manufacturing (tier 2), Electric Company (tier 2), Fire Station 7 (tier 2), Historic Office Suites (tier 2), Rise Realty (tier 2), MoPo-Shack (tier 1), Carpet Warehouse, Derelict Warehouse, Industrial Trucking, JD Shipping, Power Distribution Station #2.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.