Upgrade path

Wood Shutters Outside→ 1× Iron Shutters →Iron Shutters Outside→ 1× Steel Shutters →Steel Shutters Outside

Hit a placed block with a stone axe, claw hammer or nail gun while carrying the material of the next step.

Crafting

Craft at Workbench · makes 1

Crafted as Steel Shutters: pick this one of its variants when you place it.

Harvest drops

Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.

Salvage drops

Extra parts when salvaged with a wrench, ratchet or impact driver.

When it collapses

Falling, it leaves Scrap Metal Pile (75% of the time) where it lands.

Where to find (4 POIs)

Pop-N-Pills Factory (tier 5), Shamway Factory (tier 5), The Curren Residence (tier 2), Outlaw Outlets.

Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.