Metal Catwalk Bent
Metal stairs and catwalks are essential for that industrial look.
Upgrade path
Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step: 4 hits per upgrade.
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 (14 POIs)
Don Vittorio Spagetto Residence (tier 4), HSP Logistics (tier 4), Joe's Junction (tier 4), Hexagon Hideaway (tier 3), Johnnytown (tier 3), A1 Auto (tier 2), Navezgane Creamery (tier 2), Oreally Auto (tier 2), Box Factory, Deserted Working Stiff Tools, Destroyed Industrial Tank, Diamond Liquors, Leaking Industrial Tank, Shamway Processing.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.