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: 5 hits per upgrade.

Crafting

Craft at Backpack · makes 1

Crafted as Iron 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.

When it collapses

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

Where to find (3 POIs)

Beanthere Coffee Company (tier 4), The Curren Residence (tier 2), Shawn's Shack (tier 1).

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